e35f8411576669175e9b0529c0aec04615c0422a
braney
  Mon May 2 10:28:58 2016 -0700
changes for Gencode v24 knownGene.

diff --git src/hg/lib/txGraph.c src/hg/lib/txGraph.c
index 9beed48..f520f9a 100644
--- src/hg/lib/txGraph.c
+++ src/hg/lib/txGraph.c
@@ -18,30 +18,31 @@
 {
 struct txGraph *ret;
 
 AllocVar(ret);
 ret->vertexCount = sqlUnsigned(row[5]);
 ret->edgeCount = sqlUnsigned(row[7]);
 ret->sourceCount = sqlSigned(row[9]);
 ret->tName = cloneString(row[0]);
 ret->tStart = sqlSigned(row[1]);
 ret->tEnd = sqlSigned(row[2]);
 ret->name = cloneString(row[3]);
 safecpy(ret->strand, sizeof(ret->strand), row[4]);
 {
 int i;
 char *s = row[6];
+if (ret->vertexCount)
     AllocArray(ret->vertices, ret->vertexCount);
 for (i=0; i<ret->vertexCount; ++i)
     {
     s = sqlEatChar(s, '{');
     txVertexCommaIn(&s, &ret->vertices[i]);
     s = sqlEatChar(s, '}');
     s = sqlEatChar(s, ',');
     }
 }
 {
 int i;
 char *s = row[8];
 for (i=0; i<ret->edgeCount; ++i)
     {
     s = sqlEatChar(s, '{');