skypopen: adding some guards against NULL sessions and channels

src/mod/endpoints/mod_skypopen/skypopen_protocol.c

@@ -1739,6 +1739,7 @@ void *skypopen_do_skypeapi_thread_func(void *obj)
 			if (session) {
 				switch_channel_t *channel = switch_core_session_get_channel(session);
 
+				if(channel){
 
 					switch_mutex_lock(tech_pvt->flag_mutex);
 					switch_clear_flag(tech_pvt, TFLAG_IO);
@@ -1752,6 +1753,9 @@ void *skypopen_do_skypeapi_thread_func(void *obj)
 					switch_core_session_rwunlock(session);
 					WARNINGA("Closing session for %s\n", SKYPOPEN_P_LOG, interfacename);
 					switch_channel_hangup(channel, SWITCH_CAUSE_CRASH);
+				} else {
+					WARNINGA("NO CHANNEL ?\n", SKYPOPEN_P_LOG);
+				}
 			}
 
 			WARNINGA("Removing skype interface %s\n", SKYPOPEN_P_LOG, interfacename);
@@ -1772,6 +1776,7 @@ void *skypopen_do_skypeapi_thread_func(void *obj)
 				switch_channel_t *channel = switch_core_session_get_channel(session);
 
 
+				if(channel){
 					switch_mutex_lock(tech_pvt->flag_mutex);
 					switch_clear_flag(tech_pvt, TFLAG_IO);
 					switch_clear_flag(tech_pvt, TFLAG_VOICE);
@@ -1785,6 +1790,9 @@ void *skypopen_do_skypeapi_thread_func(void *obj)
 					WARNINGA("Closing session for %s\n", SKYPOPEN_P_LOG, interfacename);
 					switch_channel_hangup(channel, SWITCH_CAUSE_CRASH);
 
+				} else {
+					WARNINGA("NO CHANNEL ?\n", SKYPOPEN_P_LOG);
+				}
 				//skypopen_sleep(500000);
 			}