src/nnn.c | 4 +++-

diff --git a/src/nnn.c b/src/nnn.c
index d186e5aa227b80e386dfbcf08759176486b7737d..9818c347774b7d4cc973fb1b835dbac9d5be82d6 100644
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -4451,8 +4451,10 @@ 	 * to `fd` and show it in the pager. But since we didn't open the file descriptor we have no right
 	 * to close it, the caller must do it. We don't even know the path to pass to the pager and
 	 * it's a real hassle to get it. In general this just invites problems so we are blocking it.
 	 */
-	if (have_file && page)
+	if (have_file && page) {
+		DPRINTF_S("invalid get_ouptput() call");
 		return FALSE;
+	}
 
 	/* Setup file descriptors for child command */
 	if (!have_file && page) {