diff --git a/src/qti_ims.c b/src/qti_ims.c
index e33d7ad..97291e3 100644
--- a/src/qti_ims.c
+++ b/src/qti_ims.c
@@ -127,8 +127,10 @@ qti_ims_result_request_complete(
 {
     QtiImsResultRequest* req = user_data;
 
-    req->complete(req->ext, result ? BINDER_EXT_IMS_RESULT_ERROR :
-        BINDER_EXT_IMS_RESULT_OK, req->user_data);
+    if (req->complete) {
+        req->complete(req->ext, result ? BINDER_EXT_IMS_RESULT_ERROR :
+            BINDER_EXT_IMS_RESULT_OK, req->user_data);
+    }
 }
 
 static
diff --git a/src/qti_ims.h b/src/qti_ims.h
index cf3a05e..943577a 100644
--- a/src/qti_ims.h
+++ b/src/qti_ims.h
@@ -43,6 +43,9 @@
 
 typedef struct qti_radio_ext QtiRadioExt;
 
+typedef void (*QtiImsGetRegStatusFunc)(
+    BinderExtIms* ext, void* user_data);
+
 BinderExtIms*
 qti_ims_new(
     const char* slot,