diff --git a/subsys/shell/shell_log_backend.c b/subsys/shell/shell_log_backend.c
index 2a90478..38ee97c 100644
--- a/subsys/shell/shell_log_backend.c
+++ b/subsys/shell/shell_log_backend.c
@@ -143,6 +143,9 @@
 	uint8_t *src_data = (uint8_t *)msg + sizeof(struct mpsc_pbuf_hdr);
 	size_t hdr_wlen = DIV_ROUND_UP(sizeof(struct mpsc_pbuf_hdr),
 					   sizeof(uint32_t));
+	if (wlen <= hdr_wlen) {
+		return false;
+	}
 
 	dst->hdr.data = msg->buf.hdr.data;
 	memcpy(dst_data, src_data, (wlen - hdr_wlen) * sizeof(uint32_t));