diff --git a/src/common/image.cpp b/src/common/image.cpp
index c62d0a909f..d6febece49 100644
--- a/src/common/image.cpp
+++ b/src/common/image.cpp
@@ -1786,13 +1786,14 @@ wxImage::Paste(const wxImage & image, int x, int y,
                     {
                         // Copy the non masked pixel
                         memcpy(target_data + i, source_data + i, 3);
-                        // Make the copied pixel fully opaque
-                        alpha_target_data[i / 3] = wxALPHA_OPAQUE;
+                        if (alpha_target_data != NULL) // Make the copied pixel fully opaque
+                            alpha_target_data[i / 3] = wxALPHA_OPAQUE;
                     }
                 }
                 source_data += source_step;
                 target_data += target_step;
-                alpha_target_data += target_alpha_step;
+                if (alpha_target_data != NULL)
+                    alpha_target_data += target_alpha_step;
             }
         }
     }
diff --git a/tests/image/image.cpp b/tests/image/image.cpp
index 60248f0f76..c825a445a4 100644
--- a/tests/image/image.cpp
+++ b/tests/image/image.cpp
@@ -1540,6 +1540,10 @@ TEST_CASE("wxImage::Paste", "[image][paste]")
         wxImage expected(toggle_equal_size_xpm);
         actual.Paste(paste, 0, 0);
         CHECK_THAT(actual, RGBSameAs(expected));
+
+        // Without alpha using "compose" doesn't change anything.
+        actual.Paste(paste, 0, 0, wxIMAGE_ALPHA_BLEND_COMPOSE);
+        CHECK_THAT(actual, RGBSameAs(expected));
     }
 
     SECTION("Paste larger image")