diff --git a/mlir/lib/Dialect/SCF/SCF.cpp b/mlir/lib/Dialect/SCF/SCF.cpp
--- a/mlir/lib/Dialect/SCF/SCF.cpp
+++ b/mlir/lib/Dialect/SCF/SCF.cpp
@@ -164,8 +164,14 @@
 }
 
 static void print(OpAsmPrinter &p, ForOp op) {
-  p << op.getOperationName() << " " << op.getInductionVar() << " = "
-    << op.lowerBound() << " to " << op.upperBound() << " step " << op.step();
+  p << op.getOperationName() << " ";
+  if (op.getRegion().empty()) {
+    p << "<<ILLEGAL BODY>>";
+    return;
+  }
+
+  p << op.getInductionVar() << " = " << op.lowerBound() << " to "
+    << op.upperBound() << " step " << op.step();
 
   printInitializationList(p, op.getRegionIterArgs(), op.getIterOperands(),
                           " iter_args");