diff --git a/src/gui/Popups/UnexpectedErrorPopup.qml b/src/gui/Popups/UnexpectedErrorPopup.qml
index 158e5d2e..159fbb22 100644
--- a/src/gui/Popups/UnexpectedErrorPopup.qml
+++ b/src/gui/Popups/UnexpectedErrorPopup.qml
@@ -13,6 +13,11 @@ HColumnPopup {
 
     property var errors: []  // [{type, message, traceback}]
 
+    background: Rectangle {
+        color: theme.controls.popup.opaqueBackground
+            ? theme.controls.popup.opaqueBackground
+            : theme.controls.popup.background // fallback
+    }
 
     contentWidthLimit: Math.min(window.width / 1.5, 864 * theme.uiScale)
 
diff --git a/src/themes/Glass.qpl b/src/themes/Glass.qpl
index f6ee1ae3..fe6ac2d0 100644
--- a/src/themes/Glass.qpl
+++ b/src/themes/Glass.qpl
@@ -116,6 +116,12 @@ controls:
     popup:
         int defaultWidth:    minimumSupportedWidth * 1.75
         color background:    colors.mediumBackground
+        color opaqueBackground: hsluv(
+            colors.hue,
+            colors.bgSaturation,
+            colors.intensity * 7,
+            1
+        )
         color windowOverlay: hsluv(0, 0, 0, 0.7)
 
     header:
diff --git a/src/themes/Midnight.qpl b/src/themes/Midnight.qpl
index 24f62116..4327dc1b 100644
--- a/src/themes/Midnight.qpl
+++ b/src/themes/Midnight.qpl
@@ -119,6 +119,12 @@ controls:
     popup:
         int defaultWidth:    minimumSupportedWidth * 1.75
         color background:    colors.mediumBackground
+        color opaqueBackground: hsluv(
+            colors.hue,
+            colors.bgSaturation,
+            colors.intensity * 7,
+            1
+        )
         color windowOverlay: hsluv(0, 0, 0, 0.7)
 
     header: