diff --git a/source/blender/render/intern/compositor.cc b/source/blender/render/intern/compositor.cc
index ac723f7e5e7..6b7d0871335 100644
--- a/source/blender/render/intern/compositor.cc
+++ b/source/blender/render/intern/compositor.cc
@@ -465,7 +465,9 @@ class RealtimeCompositor {
  public:
   RealtimeCompositor(Render &render, const ContextInputData &input_data) : render_(render)
   {
-    BLI_assert(!BLI_thread_is_main());
+    /* Ensure that in foreground mode we are using different contexts for main and render threads,
+     * to avoid them blocking each other. */
+    BLI_assert(!BLI_thread_is_main() || G.background);
 
     /* Create resources with GPU context enabled. */
     DRW_render_context_enable(&render_);
@@ -499,7 +501,9 @@ class RealtimeCompositor {
   /* Evaluate the compositor and output to the scene render result. */
   void execute(const ContextInputData &input_data)
   {
-    BLI_assert(!BLI_thread_is_main());
+    /* Ensure that in foreground mode we are using different contexts for main and render threads,
+     * to avoid them blocking each other. */
+    BLI_assert(!BLI_thread_is_main() || G.background);
 
     DRW_render_context_enable(&render_);
     context_->update_input_data(input_data);