diff --git a/tester/call_tester.c b/tester/call_tester.c
index 326a2a29e..aa01fb48f 100644
--- a/tester/call_tester.c
+++ b/tester/call_tester.c
@@ -3078,28 +3078,35 @@ static void multiple_early_media(void) {
 	marie1_call=linphone_core_get_current_call(marie1->lc);
 	marie2_call=linphone_core_get_current_call(marie2->lc);
 
-	/*wait a bit that streams are established*/
-	wait_for_list(lcs,&dummy,1,6000);
-	CU_ASSERT_TRUE(linphone_call_get_audio_stats(pauline_call)->download_bandwidth>70);
-	CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie1_call)->download_bandwidth>70);
-	CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie2_call)->download_bandwidth>70);
+	CU_ASSERT_PTR_NOT_NULL(pauline_call);
+	CU_ASSERT_PTR_NOT_NULL(marie1_call);
+	CU_ASSERT_PTR_NOT_NULL(marie2_call);
+	
+	if (pauline_call && marie1_call && marie2_call){
+	
+		/*wait a bit that streams are established*/
+		wait_for_list(lcs,&dummy,1,6000);
+		CU_ASSERT_TRUE(linphone_call_get_audio_stats(pauline_call)->download_bandwidth>70);
+		CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie1_call)->download_bandwidth>70);
+		CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie2_call)->download_bandwidth>70);
 
-	linphone_core_accept_call(marie1->lc,linphone_core_get_current_call(marie1->lc));
-	CU_ASSERT_TRUE(wait_for_list(lcs,&marie1->stat.number_of_LinphoneCallStreamsRunning,1,3000));
-	CU_ASSERT_TRUE(wait_for_list(lcs,&pauline->stat.number_of_LinphoneCallStreamsRunning,1,3000));
+		linphone_core_accept_call(marie1->lc,linphone_core_get_current_call(marie1->lc));
+		CU_ASSERT_TRUE(wait_for_list(lcs,&marie1->stat.number_of_LinphoneCallStreamsRunning,1,3000));
+		CU_ASSERT_TRUE(wait_for_list(lcs,&pauline->stat.number_of_LinphoneCallStreamsRunning,1,3000));
 
-	/*marie2 should get her call terminated*/
-	CU_ASSERT_TRUE(wait_for_list(lcs,&marie2->stat.number_of_LinphoneCallEnd,1,1000));
+		/*marie2 should get her call terminated*/
+		CU_ASSERT_TRUE(wait_for_list(lcs,&marie2->stat.number_of_LinphoneCallEnd,1,1000));
 
-	/*wait a bit that streams are established*/
-	wait_for_list(lcs,&dummy,1,3000);
-	CU_ASSERT_TRUE(linphone_call_get_audio_stats(pauline_call)->download_bandwidth>71);
-	CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie1_call)->download_bandwidth>71);
+		/*wait a bit that streams are established*/
+		wait_for_list(lcs,&dummy,1,3000);
+		CU_ASSERT_TRUE(linphone_call_get_audio_stats(pauline_call)->download_bandwidth>71);
+		CU_ASSERT_TRUE(linphone_call_get_audio_stats(marie1_call)->download_bandwidth>71);
 
-	/*send an INFO in reverse side to check that dialogs are properly established*/
-	info=linphone_core_create_info_message(marie1->lc);
-	linphone_call_send_info_message(marie1_call,info);
-	CU_ASSERT_TRUE(wait_for_list(lcs,&pauline->stat.number_of_inforeceived,1,3000));
+		/*send an INFO in reverse side to check that dialogs are properly established*/
+		info=linphone_core_create_info_message(marie1->lc);
+		linphone_call_send_info_message(marie1_call,info);
+		CU_ASSERT_TRUE(wait_for_list(lcs,&pauline->stat.number_of_inforeceived,1,3000));
+	}
 
 	linphone_core_terminate_all_calls(pauline->lc);
 	CU_ASSERT_TRUE(wait_for_list(lcs,&pauline->stat.number_of_LinphoneCallEnd,1,3000));