diff --git a/src/ol/renderer/canvas/Layer.js b/src/ol/renderer/canvas/Layer.js
index f7bfa32164..6eedbce160 100644
--- a/src/ol/renderer/canvas/Layer.js
+++ b/src/ol/renderer/canvas/Layer.js
@@ -120,6 +120,7 @@ class CanvasLayerRenderer extends LayerRenderer {
       pixelContext.drawImage(image, col, row, 1, 1, 0, 0, 1, 1);
       data = pixelContext.getImageData(0, 0, 1, 1).data;
     } catch (err) {
+      pixelContext = null;
       return null;
     }
     return data;
diff --git a/src/ol/webgl/TileTexture.js b/src/ol/webgl/TileTexture.js
index 7018f6dbda..8c457639bf 100644
--- a/src/ol/webgl/TileTexture.js
+++ b/src/ol/webgl/TileTexture.js
@@ -412,6 +412,7 @@ class TileTexture extends EventTarget {
       );
       data = pixelContext.getImageData(0, 0, 1, 1).data;
     } catch (err) {
+      pixelContext = null;
       return null;
     }
     return data;