diff --git a/src/ext/lib/aard/Aard.ts b/src/ext/lib/aard/Aard.ts
index 6f2e82d..63eee00 100644
--- a/src/ext/lib/aard/Aard.ts
+++ b/src/ext/lib/aard/Aard.ts
@@ -687,7 +687,13 @@ export class Aard {
         // if detected aspect ratio is different from the current aspect ratio
         // if (this.testResults.aspectRatioUpdated) {
         //   this.timer.arChanged();
-          this.updateAspectRatio();
+        const finalAr = this.getAr();
+        if (finalAr > 0) {
+          this.updateAspectRatio(finalAr);
+        } else {
+          this.testResults.aspectRatioInvalid = true;
+          this.testResults.aspectRatioInvalidReason = finalAr.toFixed(3);
+        }
         // }
 
         // if we got "no letterbox" OR aspectRatioUpdated
diff --git a/src/ext/lib/aard/AardDebugUi.ts b/src/ext/lib/aard/AardDebugUi.ts
index 01e79a0..dd082b1 100644
--- a/src/ext/lib/aard/AardDebugUi.ts
+++ b/src/ext/lib/aard/AardDebugUi.ts
@@ -370,7 +370,8 @@ export class AardDebugUi {
     out = `${out}
 
       -- UNCERTAIN FLAGS
-      AR: ${testResults.aspectRatioUncertain} (reason: ${testResults.aspectRatioUncertainReason ?? 'n/a'}); top row: ${testResults.topRowUncertain}; bottom row: ${testResults.bottomRowUncertain}
+      AR: ${testResults.aspectRatioUncertain} (reason: ${testResults.aspectRatioUncertainReason ?? 'n/a'}); top row: ${testResults.topRowUncertain}; bottom row: ${testResults.bottomRowUncertain}${
+        testResults.aspectRatioInvalid ? `\nINVALID_AR (reason: ${testResults.aspectRatioInvalidReason ?? 'n/a'})` : ''}
 
       -- GUARD & IMAGE LINE
       bottom guard: ${testResults.guardLine.bottom}       image: ${testResults.guardLine.invalidated ? 'n/a' : testResults.imageLine.bottom}
diff --git a/src/ext/lib/aard/interfaces/aard-test-results.interface.ts b/src/ext/lib/aard/interfaces/aard-test-results.interface.ts
index 4aaadf7..20cc29e 100644
--- a/src/ext/lib/aard/interfaces/aard-test-results.interface.ts
+++ b/src/ext/lib/aard/interfaces/aard-test-results.interface.ts
@@ -39,7 +39,9 @@ export interface AardTestResults {
   letterboxWidth: number,
   letterboxOffset: number,
   logoDetected: [boolean, boolean, boolean, boolean]
+  aspectRatioInvalid: boolean
   aspectRatioUncertainReason?: string
+  aspectRatioInvalidReason?: string
 }
 
 export function initAardTestResults(settings: AardSettings): AardTestResults {
@@ -81,7 +83,8 @@ export function initAardTestResults(settings: AardSettings): AardTestResults {
     activeAspectRatio: 0,
     letterboxWidth: 0,
     letterboxOffset: 0,
-    logoDetected: [false, false, false, false]
+    logoDetected: [false, false, false, false],
+    aspectRatioInvalid: false,
   }
 }
 
@@ -120,4 +123,5 @@ export function resetAardTestResults(results: AardTestResults): void {
   results.aspectRatioUncertainReason = null;
   results.topRowUncertain = false;
   results.bottomRowUncertain = false;
+  results.aspectRatioInvalid = false;
 }