diff --git a/mlir/test/Analysis/invalid.mlir b/mlir/test/Analysis/invalid.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/test/Analysis/invalid.mlir
@@ -0,0 +1,7 @@
+// RUN: mlir-opt -split-input-file -pass-pipeline='builtin.module(func.func(test-foo-analysis))'  %s -verify-diagnostics
+
+// -----
+
+// expected-error @+1 {{expected at least one block in the region}}
+func.func private @no_block_func_declaration() -> ()
+
diff --git a/mlir/test/lib/Analysis/TestDataFlowFramework.cpp b/mlir/test/lib/Analysis/TestDataFlowFramework.cpp
--- a/mlir/test/lib/Analysis/TestDataFlowFramework.cpp
+++ b/mlir/test/lib/Analysis/TestDataFlowFramework.cpp
@@ -96,6 +96,9 @@
   if (top->getNumRegions() != 1)
     return top->emitError("expected a single region top-level op");
 
+  if (top->getRegion(0).getBlocks().size() < 1)
+    return top->emitError("expected at least one block in the region");
+
   // Initialize the top-level state.
   getOrCreate<FooState>(&top->getRegion(0).front())->join(0);