diff --git a/gcc/testsuite/g++.dg/pr103007.C b/gcc/testsuite/g++.dg/pr103007.C
new file mode 100644
index 0000000000000000000000000000000000000000..1631a85080039f29b83c97d2f62c66be9eac109f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/pr103007.C
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-additional-options "-O3" } */
+
+typedef float MushMeshVector[4];
+struct MushMeshQuaternionPair {
+  void VectorRotate(MushMeshVector &);
+  MushMeshVector m_first;
+  MushMeshVector m_second;
+};
+void 
+MushMeshQuaternionPair::
+VectorRotate(MushMeshVector &ioVec)  {
+  ioVec[2] = (2 - m_first[1] + m_first[3] * 0);
+  ioVec[3] = (m_first[3] + m_first[1] - m_first[2] * 0);
+  float c = ioVec[2], d = ioVec[3];
+  ioVec[2] = (0 - d * m_second[1]);
+  ioVec[3] = (2 - c * m_second[1]);
+}
+
diff --git a/gcc/tree-vect-slp-patterns.c b/gcc/tree-vect-slp-patterns.c
index 6b37e9bac6f3f86a51d1a532a4c570a37af76eac..5e64a9bc417ab6b855e8791fd482dba23287f467 100644
--- a/gcc/tree-vect-slp-patterns.c
+++ b/gcc/tree-vect-slp-patterns.c
@@ -1250,13 +1250,17 @@ complex_fms_pattern::matches (complex_operation_t op,
 
   auto childs = SLP_TREE_CHILDREN (nodes[0]);
   auto l0node = SLP_TREE_CHILDREN (childs[0]);
-  auto l1node = SLP_TREE_CHILDREN (childs[1]);
 
   /* Now operand2+4 may lead to another expression.  */
   auto_vec<slp_tree> left_op, right_op;
   left_op.safe_splice (SLP_TREE_CHILDREN (l0node[1]));
   right_op.safe_splice (SLP_TREE_CHILDREN (nodes[1]));
 
+  /* If these nodes don't have any children then they're
+     not ones we're interested in.  */
+  if (left_op.length () != 2 || right_op.length () != 2)
+    return IFN_LAST;
+
   bool is_neg = vect_normalize_conj_loc (left_op);
 
   bool conj_first_operand = false;