st.c | 2 +-

diff --git a/st.c b/st.c
index e1934435b6f8aada31ffaed553da12d9c02a2966..c3d0888262ddc43d301ad4a29409e345cd182e13 100644
--- a/st.c
+++ b/st.c
@@ -547,7 +547,7 @@ 		XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 				XA_ATOM, 32, PropModeReplace,
 				(unsigned char *) &string, 1);
 		xev.property = xsre->property;
-	} else if(xsre->target == sel.xtarget) {
+	} else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 		XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 				xsre->target, 8, PropModeReplace,
 				(unsigned char *) sel.clip, strlen(sel.clip));