diff --git a/jbpm-runtime-manager/src/main/java/org/jbpm/runtime/manager/impl/PerProcessInstanceRuntimeManager.java b/jbpm-runtime-manager/src/main/java/org/jbpm/runtime/manager/impl/PerProcessInstanceRuntimeManager.java
index be011914de..dd46edd7c1 100644
--- a/jbpm-runtime-manager/src/main/java/org/jbpm/runtime/manager/impl/PerProcessInstanceRuntimeManager.java
+++ b/jbpm-runtime-manager/src/main/java/org/jbpm/runtime/manager/impl/PerProcessInstanceRuntimeManager.java
@@ -166,11 +166,13 @@ public void signalEvent(String type, Object event) {
         
         // first signal with new context in case there are start event with signal
         KieSession signalSession = null;
+        Set<RuntimeEngine> signalledEngines = new HashSet<>();
         RuntimeEngine runtimeEngine = getRuntimeEngine(ProcessInstanceIdContext.get());
         try {
             // signal execution can rise errors
             signalSession = runtimeEngine.getKieSession();
             signalSession.signalEvent(type, event);
+            signalledEngines.add(runtimeEngine);
         } finally {
             // ensure we clean up
             if(signalSession!=null) {
@@ -185,7 +187,10 @@ public void signalEvent(String type, Object event) {
             runtimeEngine = getRuntimeEngine(ProcessInstanceIdContext.get(Long.parseLong(piId)));
             try {
                 // signal execution can rise errors
-                runtimeEngine.getKieSession().signalEvent(type, event);
+                if (!signalledEngines.contains(runtimeEngine)) {
+                    runtimeEngine.getKieSession().signalEvent(type, event);
+                    signalledEngines.add(runtimeEngine);
+                }
             } finally {
                 // ensure we clean up
                 disposeRuntimeEngine(runtimeEngine);
@@ -215,8 +220,11 @@ public void signalEvent(String type, Object event) {
                 if (context != null && context instanceof ProcessInstanceIdContext 
                         && ((ProcessInstanceIdContext) context).getContextId() != null) {
                     try {
-                        engineImpl.getKieSession().signalEvent(type, event,
-                                ((ProcessInstanceIdContext) context).getContextId());
+                        if (!signalledEngines.contains(engineImpl)) {
+                            engineImpl.getKieSession().signalEvent(type, event,
+                                    ((ProcessInstanceIdContext) context).getContextId());
+                            signalledEngines.add(engineImpl);
+                        }
                     } catch (org.drools.persistence.api.SessionNotFoundException ex) {
                         logger.warn(
                                 "Signal event cannot proceed because of session not found exception {} for engine {}",
@@ -226,7 +234,6 @@ public void signalEvent(String type, Object event) {
                 }
             }
             if (!enginesToDelete.isEmpty()) {
-
                 currentlyActive.keySet().removeAll(enginesToDelete);
             }
         }