Fix crash.

theano/tensor/raw_random.py

@@ -379,14 +379,18 @@ def _infer_ndim_bcast(ndim, shape, *args):
         ndim = template.ndim
     else:
         v_shape = tensor.as_tensor_variable(shape)
+        if v_shape.ndim != 1:
+            raise TypeError(
+                "shape must be a vector or list of scalar, got '%s'" % v_shape)
+
+        if ndim is None:
+            ndim = tensor.get_vector_length(v_shape)
+        bcast = [False] * ndim
 
     if v_shape.ndim != 1:
         raise TypeError("shape must be a vector or list of scalar, got '%s'" %
                         v_shape)
 
-    if ndim is None:
-        ndim = tensor.get_vector_length(v_shape)
-        bcast = [False] * ndim
     if (not (v_shape.dtype.startswith('int') or
              v_shape.dtype.startswith('uint'))):
         raise TypeError('shape must be an integer vector or list',