diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
index e2b32b5f..56ca1506 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/ConstraintsProcessing.kt
@@ -235,7 +235,6 @@ internal class ConstraintsProcessing(private var dispatchingFront: Dispatcher.Di
             if (isFront() || !active.isPrincipal()) {
                 matches
             } else {
-                assert( matches.all { it.isPrincipal() } )
                 execQueue.postponeFutureMatches(matches)
             }