Index: main/channel.c
===================================================================
--- main/channel.c	(revision 228265)
+++ main/channel.c	(working copy)
@@ -2965,6 +2965,8 @@
 					if ((dup = ast_frisolate(new_frame))) {
 						AST_LIST_NEXT(dup, frame_list) = AST_LIST_NEXT(cur, frame_list);
 						ast_frfree(new_frame);
+						AST_LIST_NEXT(cur, frame_list) = NULL;
+						/* This frees an entire list of frames, which is why we must NULL the next pointer */
 						ast_frfree(cur);
 						cur = dup;
 					}
@@ -3038,6 +3040,7 @@
 						chan->fout = FRAMECOUNT_INC(chan->fout);
 					}
 				}
+				AST_LIST_NEXT(cur, frame_list) = NULL;
 				ast_frfree(cur);
 			}