diff --git a/web/app/@types/markdown-toolbar-element/index.d.ts b/web/app/@types/markdown-toolbar-element/index.d.ts
index a8812c83..f4ed19d2 100644
--- a/web/app/@types/markdown-toolbar-element/index.d.ts
+++ b/web/app/@types/markdown-toolbar-element/index.d.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 declare namespace JSX {
   interface IntrinsicElements {
     'markdown-toolbar': {
diff --git a/web/app/common/fetcher.ts b/web/app/common/fetcher.ts
index a72c4c0d..908bdd04 100644
--- a/web/app/common/fetcher.ts
+++ b/web/app/common/fetcher.ts
@@ -81,7 +81,9 @@ const fetcher = methods.reduce<Partial<FetcherObject>>((acc, method) => {
           try {
             err = JSON.parse(text);
           } catch (e) {
-            throw text;
+            // eslint-disable-next-line no-console
+            console.error(err);
+            throw 'Something went wrong.';
           }
           throw err;
         });
diff --git a/web/app/components/comment/comment.tsx b/web/app/components/comment/comment.tsx
index 575d0db8..392c2eb1 100644
--- a/web/app/components/comment/comment.tsx
+++ b/web/app/components/comment/comment.tsx
@@ -12,7 +12,8 @@ import { StaticStore } from '@app/common/static_store';
 import debounce from '@app/utils/debounce';
 import copy from '@app/common/copy';
 import { Theme, BlockTTL, Comment as CommentType, PostInfo, User, CommentMode, Image } from '@app/common/types';
-import { extractErrorMessageFromResponse, FetcherResponse } from '@app/utils/errorUtils';
+import { extractErrorMessageFromResponse, FetcherError } from '@app/utils/errorUtils';
+import { isUserAnonymous } from '@app/utils/isUserAnonymous';
 
 import { Input } from '@app/components/input';
 import { AvatarIcon } from '@app/components/avatar-icon';
@@ -213,7 +214,7 @@ export class Comment extends Component<Props, State> {
     }
   }
 
-  handleVoteError(e: FetcherResponse, originalScore: number, originalDelta: number) {
+  handleVoteError(e: FetcherError, originalScore: number, originalDelta: number) {
     this.setState({
       scoreDelta: originalDelta,
       cachedScore: originalScore,
@@ -315,7 +316,7 @@ export class Comment extends Component<Props, State> {
    * Defines whether current client is logged in via `Anonymous provider`
    */
   isAnonymous(): boolean {
-    return this.props.user! && this.props.user!.id.substr(0, 10) === 'anonymous_';
+    return isUserAnonymous(this.props.user);
   }
 
   /**
@@ -369,6 +370,7 @@ export class Comment extends Component<Props, State> {
     const isUpvotingDisabled = upvotingDisabledReason !== null;
     const editable = props.repliesCount === 0 && state.editDeadline;
     const scoreSignEnabled = !StaticStore.config.positive_score;
+    const uploadImageHandler = this.isAnonymous() ? undefined : this.props.uploadImage;
 
     /**
      * CommentType adapted for rendering
@@ -676,7 +678,7 @@ export class Comment extends Component<Props, State> {
             onCancel={this.toggleReplying}
             getPreview={this.props.getPreview!}
             autofocus={true}
-            uploadImage={this.props.uploadImage!}
+            uploadImage={uploadImageHandler}
           />
         )}
 
@@ -691,7 +693,7 @@ export class Comment extends Component<Props, State> {
             getPreview={this.props.getPreview!}
             errorMessage={state.editDeadline === null ? 'Editing time has expired.' : undefined}
             autofocus={true}
-            uploadImage={this.props.uploadImage!}
+            uploadImage={uploadImageHandler}
           />
         )}
       </article>
diff --git a/web/app/components/input/input.tsx b/web/app/components/input/input.tsx
index e669be04..158982e8 100644
--- a/web/app/components/input/input.tsx
+++ b/web/app/components/input/input.tsx
@@ -38,7 +38,7 @@ interface Props {
   getPreview(text: string): Promise<string>;
   /** action on cancel. optional as root input has no cancel option */
   onCancel?: () => void;
-  uploadImage: (image: File) => Promise<Image>;
+  uploadImage?: (image: File) => Promise<Image>;
 }
 
 interface State {
@@ -194,6 +194,7 @@ export class Input extends Component<Props, State> {
   }
 
   onDragOver(e: DragEvent) {
+    if (!this.props.uploadImage) return;
     if (StaticStore.config.max_image_size === 0) return;
     if (!this.textAreaRef) return;
     if (!e.dataTransfer) return;
@@ -204,6 +205,7 @@ export class Input extends Component<Props, State> {
   }
 
   onDrop(e: DragEvent) {
+    if (!this.props.uploadImage) return;
     if (StaticStore.config.max_image_size === 0) return;
     if (!e.dataTransfer) return;
 
@@ -217,20 +219,19 @@ export class Input extends Component<Props, State> {
 
   /** wrapper with error handling for props.uploadImage */
   uploadImage(file: File): Promise<Image | Error> {
-    return this.props
-      .uploadImage(file)
-      .catch(
-        (e: ApiError | string) =>
-          new Error(
-            typeof e === 'string'
-              ? `${file.name} upload failed with "${e}"`
-              : `${file.name} upload failed with "${e.error}"`
-          )
-      );
+    return this.props.uploadImage!(file).catch(
+      (e: ApiError | string) =>
+        new Error(
+          typeof e === 'string'
+            ? `${file.name} upload failed with "${e}"`
+            : `${file.name} upload failed with "${e.error}"`
+        )
+    );
   }
 
   /** performs upload process */
   async uploadImages(files: File[]) {
+    if (!this.props.uploadImage) return;
     if (!this.textAreaRef) return;
 
     /** Human readable image size limit, i.e 5MB */
diff --git a/web/app/components/root/root.tsx b/web/app/components/root/root.tsx
index 568822bb..9c41d3d1 100644
--- a/web/app/components/root/root.tsx
+++ b/web/app/components/root/root.tsx
@@ -49,6 +49,7 @@ import { Input } from '@app/components/input';
 import Preloader from '@app/components/preloader';
 import { Thread } from '@app/components/thread';
 import { uploadImage } from '@app/common/api';
+import { isUserAnonymous } from '@app/utils/isUserAnonymous';
 
 interface Props {
   user: User | null;
@@ -192,6 +193,13 @@ export class Root extends Component<Props, State> {
     });
   }
 
+  /**
+   * Defines whether current client is logged in via `Anonymous provider`
+   */
+  isAnonymous(): boolean {
+    return isUserAnonymous(this.props.user);
+  }
+
   render(props: RenderableProps<Props>, { isLoaded, isCommentsListLoading, commentsShown }: State) {
     if (!isLoaded) {
       return (
@@ -205,6 +213,7 @@ export class Root extends Component<Props, State> {
 
     const isGuest = !props.user;
     const isCommentsDisabled = !!props.info.read_only;
+    const imageUploadHandler = this.isAnonymous() ? undefined : this.props.uploadImage;
 
     return (
       <div id={NODE_ID}>
@@ -235,7 +244,7 @@ export class Root extends Component<Props, State> {
                   userId={this.props.user!.id}
                   onSubmit={(text, title) => this.props.addComment(text, title)}
                   getPreview={this.props.getPreview}
-                  uploadImage={this.props.uploadImage}
+                  uploadImage={imageUploadHandler}
                 />
               )}
 
diff --git a/web/app/utils/errorUtils.ts b/web/app/utils/errorUtils.ts
index 400612fe..4b85e081 100644
--- a/web/app/utils/errorUtils.ts
+++ b/web/app/utils/errorUtils.ts
@@ -20,14 +20,15 @@ const errorMessageForCodes = new Map([
   [18, 'Requested file cannot be found.'],
 ]);
 
-export type FetcherResponse =
+export type FetcherError =
   | string
   | {
       code?: number;
       details?: string;
+      error: string;
     };
 
-export function extractErrorMessageFromResponse(response: FetcherResponse): string {
+export function extractErrorMessageFromResponse(response: FetcherError): string {
   const defaultErrorMessage = 'Something went wrong. Please try again a bit later.';
   if (!response) {
     return defaultErrorMessage;
diff --git a/web/app/utils/isUserAnonymous.ts b/web/app/utils/isUserAnonymous.ts
new file mode 100644
index 00000000..e64aa9e6
--- /dev/null
+++ b/web/app/utils/isUserAnonymous.ts
@@ -0,0 +1,8 @@
+import { User } from '@app/common/types';
+
+/**
+ * Defines whether current client is logged in via `Anonymous provider`
+ */
+export function isUserAnonymous(user?: User | null): boolean {
+  return user! && user!.id.substr(0, 10) === 'anonymous_';
+}
diff --git a/web/package-lock.json b/web/package-lock.json
index d6838b69..324d49c8 100644
--- a/web/package-lock.json
+++ b/web/package-lock.json
@@ -4854,7 +4854,8 @@
         "ansi-regex": {
           "version": "2.1.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "aproba": {
           "version": "1.2.0",
@@ -4875,12 +4876,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -4895,17 +4898,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -5022,7 +5028,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -5034,6 +5041,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -5048,6 +5056,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -5055,12 +5064,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -5079,6 +5090,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -5159,7 +5171,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -5171,6 +5184,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -5256,7 +5270,8 @@
         "safe-buffer": {
           "version": "5.1.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "safer-buffer": {
           "version": "2.1.2",
@@ -5292,6 +5307,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
@@ -5311,6 +5327,7 @@
           "version": "3.0.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "ansi-regex": "^2.0.0"
           }
@@ -5354,12 +5371,14 @@
         "wrappy": {
           "version": "1.0.2",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "yallist": {
           "version": "3.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         }
       }
     },
diff --git a/web/package.json b/web/package.json
index 51ebfdcd..426972c3 100644
--- a/web/package.json
+++ b/web/package.json
@@ -5,7 +5,7 @@
     "build": "webpack --mode production",
     "start": "webpack-dev-server --mode development",
     "check": "tsc -p tsconfig.json --noEmit --skipLibCheck",
-    "lint": "eslint --ext=.ts,.tsx,.js,.jsx .",
+    "lint": "eslint --max-warnings=0 --ext=.ts,.tsx,.js,.jsx .",
     "test": "jest",
     "test:coverage": "jest --coverage",
     "prettier": "prettier --write \"./**/*.{js,jsx,ts,tsx,scss}\""