diff --git a/app/shaders/alphaover.frag b/app/shaders/alphaover.frag
index a5467e0a3..785a5ebec 100644
--- a/app/shaders/alphaover.frag
+++ b/app/shaders/alphaover.frag
@@ -11,6 +11,11 @@ void main(void) {
   vec4 base_col = texture2D(base_in, ove_texcoord);
   vec4 blend_col = texture2D(blend_in, ove_texcoord);
 
+  if (!base_in_enabled && !blend_in_enabled) {
+    gl_FragColor = vec4(0.0);
+    return;
+  }
+
   if (!base_in_enabled) {
     gl_FragColor = blend_col;
     return;