patch 7.4.1811
Problem:    Netbeans channel gets garbage collected.
Solution:   Set reference in nb_channel.
diff --git a/src/eval.c b/src/eval.c
index b3a3b41..2b4f230 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -7025,6 +7025,9 @@
 #ifdef FEAT_JOB_CHANNEL
     abort = abort || set_ref_in_channel(copyID);
 #endif
+#ifdef FEAT_NETBEANS_INTG
+    abort = abort || set_ref_in_nb_channel(copyID);
+#endif
 
     if (!abort)
     {