manager: Tolerate stasis messages with no channel snapshot.

In some cases I have yet to determine some stasis messages may
be created without a channel snapshot. This change adds some
tolerance to this scenario, preventing a crash from occurring.

diff --git a/main/manager_channels.c b/main/manager_channels.c
index 9aa980da3a85cec06b858c2baa429a15cb816921..57bf82808885b21eece3fd0b0b0fa643edd2d234 100644 (file)
--- a/main/manager_channels.c
+++ b/main/manager_channels.c
@@ -467,7 +467,7 @@ struct ast_str *ast_manager_build_channel_state_string_prefix(
        char *connected_name;
        int res;
 
-       if (snapshot->base->tech_properties & AST_CHAN_TP_INTERNAL) {
+       if (!snapshot || (snapshot->base->tech_properties & AST_CHAN_TP_INTERNAL)) {
                return NULL;
        }