diff --git a/coreapi/bellesip_sal/sal_impl.h b/coreapi/bellesip_sal/sal_impl.h
index b75be9156..bd942c9aa 100644
--- a/coreapi/bellesip_sal/sal_impl.h
+++ b/coreapi/bellesip_sal/sal_impl.h
@@ -109,6 +109,7 @@ struct SalOp{
 	bool_t manual_refresher;
 	bool_t has_auth_pending;
 	bool_t supports_session_timers;
+	bool_t op_released;
 };
 
 
diff --git a/coreapi/bellesip_sal/sal_op_impl.c b/coreapi/bellesip_sal/sal_op_impl.c
index dff9f0713..5a55d2900 100644
--- a/coreapi/bellesip_sal/sal_op_impl.c
+++ b/coreapi/bellesip_sal/sal_op_impl.c
@@ -38,6 +38,7 @@ void sal_op_release(SalOp *op){
 	if (op->refresher) {
 		belle_sip_refresher_stop(op->refresher);
 	}
+	op->op_released = TRUE;
 	sal_op_unref(op);
 }
 
diff --git a/coreapi/bellesip_sal/sal_op_presence.c b/coreapi/bellesip_sal/sal_op_presence.c
index c0fcc25b0..f5ec79ad8 100644
--- a/coreapi/bellesip_sal/sal_op_presence.c
+++ b/coreapi/bellesip_sal/sal_op_presence.c
@@ -55,7 +55,9 @@ static void presence_process_dialog_terminated(void *ctx, const belle_sip_dialog
 	if (op->dialog) {
 		if (belle_sip_dialog_is_server(op->dialog)){
 			ms_message("Incoming subscribtion from [%s] terminated",sal_op_get_from(op));
-			op->base.root->callbacks.subscribe_presence_closed(op, sal_op_get_from(op));
+			if (!op->op_released){
+				op->base.root->callbacks.subscribe_presence_closed(op, sal_op_get_from(op));
+			}
 		}
 		set_or_update_dialog(op, NULL);
 	}
@@ -98,7 +100,9 @@ static void presence_response_event(void *op_base, const belle_sip_response_even
 	if (code>=300) {
 		if (strcmp("SUBSCRIBE",belle_sip_request_get_method(request))==0){
 			ms_message("subscription to [%s] rejected",sal_op_get_to(op));
-			op->base.root->callbacks.notify_presence(op,SalSubscribeTerminated, NULL,NULL); /*NULL = offline*/
+			if (!op->op_released){
+				op->base.root->callbacks.notify_presence(op,SalSubscribeTerminated, NULL,NULL); /*NULL = offline*/
+			}
 			return;
 		}
 	}
@@ -156,7 +160,9 @@ static void presence_process_timeout(void *user_ctx, const belle_sip_timeout_eve
 	
 	if (strcmp("SUBSCRIBE",belle_sip_request_get_method(request))==0){
 		ms_message("subscription to [%s] timeout",sal_op_get_to(op));
-		op->base.root->callbacks.notify_presence(op,SalSubscribeTerminated, NULL,NULL); /*NULL = offline*/
+		if (!op->op_released){
+			op->base.root->callbacks.notify_presence(op,SalSubscribeTerminated, NULL,NULL); /*NULL = offline*/
+		}
 	}
 }
 
@@ -176,12 +182,13 @@ static SalPresenceModel * process_presence_notification(SalOp *op, belle_sip_req
 		return NULL;
 
 	if (body==NULL) return NULL;
-
-	op->base.root->callbacks.parse_presence_requested(op,
+	if (!op->op_released){
+		op->base.root->callbacks.parse_presence_requested(op,
 							  belle_sip_header_content_type_get_type(content_type),
 							  belle_sip_header_content_type_get_subtype(content_type),
 							  body,
 							  &result);
+	}
 
 	return result;
 }
@@ -210,7 +217,9 @@ static void handle_notify(SalOp *op, belle_sip_request_t *req, belle_sip_dialog_
 			/* Presence notification body parsed successfully. */
 
 			resp = sal_op_create_response_from_request(op, req, 200); /*create first because the op may be destroyed by notify_presence */
-			op->base.root->callbacks.notify_presence(op, sub_state, presence_model, NULL);
+			if (!op->op_released){
+				op->base.root->callbacks.notify_presence(op, sub_state, presence_model, NULL);
+			}
 		} else if (body){
 			/* Formatting error in presence notification body. */
 			ms_warning("Wrongly formatted presence document.");
diff --git a/coreapi/callbacks.c b/coreapi/callbacks.c
index 814452ad0..7a068fd8c 100644
--- a/coreapi/callbacks.c
+++ b/coreapi/callbacks.c
@@ -1058,6 +1058,7 @@ static void vfu_request(SalOp *op){
 static void dtmf_received(SalOp *op, char dtmf){
 	LinphoneCore *lc=(LinphoneCore *)sal_get_user_pointer(sal_op_get_sal(op));
 	LinphoneCall *call=(LinphoneCall*)sal_op_get_user_pointer(op);
+	if (!call) return;
 	linphone_core_notify_dtmf_received(lc, call, dtmf);
 }
 
diff --git a/coreapi/presence.c b/coreapi/presence.c
index b10f1e35f..f69ddec6e 100644
--- a/coreapi/presence.c
+++ b/coreapi/presence.c
@@ -1888,10 +1888,17 @@ void linphone_notify_recv(LinphoneCore *lc, SalOp *op, SalSubscribeStatus ss, Sa
 		return ;
 	}
 	if (ss==SalSubscribeTerminated){
-		sal_op_release(op);
 		if (lf){
-			lf->outsub=NULL;
+			if (lf->outsub != op){
+				sal_op_release(op);
+			}
+			if (lf->outsub){
+				sal_op_release(lf->outsub);
+				lf->outsub=NULL;
+			}
 			lf->subscribe_active=FALSE;
+		}else{
+			sal_op_release(op);
 		}
 	}
 }