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-rw-r--r--apps/app_sendtext.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/apps/app_sendtext.c b/apps/app_sendtext.c
index e95ff6158..f2822711d 100644
--- a/apps/app_sendtext.c
+++ b/apps/app_sendtext.c
@@ -60,7 +60,9 @@ static int sendtext_exec(struct ast_channel *chan, void *data)
AST_APP_ARG(text);
);
- if (ast_strlen_zero(data)) {
+ /* NOT ast_strlen_zero, because some protocols (e.g. SIP) MUST be able to
+ * send a zero-length message. */
+ if (!data) {
ast_log(LOG_WARNING, "SendText requires an argument (text)\n");
return -1;
} else