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-rw-r--r--src/modules/mavlink/mavlink_main.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/modules/mavlink/mavlink_main.cpp b/src/modules/mavlink/mavlink_main.cpp
index 0d932d20a..4448f8d6f 100644
--- a/src/modules/mavlink/mavlink_main.cpp
+++ b/src/modules/mavlink/mavlink_main.cpp
@@ -763,7 +763,7 @@ Mavlink::send_message(const uint8_t msgid, const void *msg)
_last_write_try_time = hrt_absolute_time();
/* check if there is space in the buffer, let it overflow else */
- if (buf_free < TX_BUFFER_GAP) {
+ if ((buf_free < TX_BUFFER_GAP) || (buf_free < packet_len)) {
/* no enough space in buffer to send */
count_txerr();
count_txerrbytes(packet_len);