diff --git a/ril/libril/ril.cpp b/ril/libril/ril.cpp
index 337b355..3abe559 100644
--- a/ril/libril/ril.cpp
+++ b/ril/libril/ril.cpp
@@ -782,9 +782,11 @@ void RIL_onUnsolicitedResponse(int unsolResponse, const void *data,
     int rwlockRet = pthread_rwlock_rdlock(radioServiceRwlockPtr);
     assert(rwlockRet == 0);
 
-    ret = s_unsolResponses[unsolResponseIndex].responseFunction(
-            (int) soc_id, responseType, 0, RIL_E_SUCCESS, const_cast<void*>(data),
-            datalen);
+    if (s_unsolResponses[unsolResponseIndex].responseFunction) {
+        ret = s_unsolResponses[unsolResponseIndex].responseFunction(
+                (int) soc_id, responseType, 0, RIL_E_SUCCESS, const_cast<void*>(data),
+                datalen);
+    }
 
     rwlockRet = pthread_rwlock_unlock(radioServiceRwlockPtr);
     assert(rwlockRet == 0);