From af3a797dba1398dc387b01357d30bec3c2e8bca4 Mon Sep 17 00:00:00 2001
From: Lewis Blake <lewis.blake@met.no>
Date: Tue, 1 Oct 2024 14:12:19 +0000
Subject: [PATCH] check xr.DataArray first

---
 pyaerocom/colocation/colocated_data.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pyaerocom/colocation/colocated_data.py b/pyaerocom/colocation/colocated_data.py
index 376ee2d31..e2d983bd1 100644
--- a/pyaerocom/colocation/colocated_data.py
+++ b/pyaerocom/colocation/colocated_data.py
@@ -40,10 +40,10 @@ def ensure_correct_dimensions(data: xr.DataArray):
     If a ColocatedData object is created outside of pyaerocom, this checking is needed.
     This function is used as part of the model validator.
     """
-    shape = data.shape[0]
-
     if not isinstance(data, xr.DataArray):
         raise ValueError("Could not interpret data")
+
+    shape = data.shape[0]
     num_dims = len(data.dims)
 
     if num_dims not in (2, 3, 4):