diff --git a/reactor/Core/src/jetbrains/mps/logic/reactor/core/Handler.kt b/reactor/Core/src/jetbrains/mps/logic/reactor/core/Handler.kt
index 66ef4ac0..2c7545d6 100644
--- a/reactor/Core/src/jetbrains/mps/logic/reactor/core/Handler.kt
+++ b/reactor/Core/src/jetbrains/mps/logic/reactor/core/Handler.kt
@@ -59,9 +59,6 @@ class Handler : Matcher.AuxOccurrences {
             queue(constraint.occurrence(this, noLogicalContext))
         }
         catch (t: Throwable) {
-            for (pm in activationStack) {
-                trace.trigger(pm)
-            }
             throw t
         }
     }