diff --git a/spectacles/exceptions.py b/spectacles/exceptions.py
index baef9fbc..e2577dd0 100644
--- a/spectacles/exceptions.py
+++ b/spectacles/exceptions.py
@@ -99,7 +99,7 @@ def __init__(
         field_name: str,
         message: str,
         severity: str,
-        lookml_url: str,
+        lookml_url: Optional[str],
         file_path: Optional[str],
         line_number: Optional[int] = None,
     ):
diff --git a/spectacles/validators/lookml.py b/spectacles/validators/lookml.py
index 37910300..60313fae 100644
--- a/spectacles/validators/lookml.py
+++ b/spectacles/validators/lookml.py
@@ -1,4 +1,4 @@
-from typing import Dict, Any
+from typing import Dict, Any, Optional
 from spectacles.client import LookerClient
 from spectacles.exceptions import LookMLError
 
@@ -25,6 +25,7 @@ def validate(self, project: str, severity: str = "warning") -> Dict[str, Any]:
         severity_level = NAME_TO_LEVEL[severity]
         validation_results = self.client.lookml_validation(project)
         errors = []
+        lookml_url: Optional[str] = None
         for error in validation_results["errors"]:
             if error["file_path"]:
                 lookml_url = (
@@ -36,8 +37,6 @@ def validate(self, project: str, severity: str = "warning") -> Dict[str, Any]:
                 )
                 if error["line_number"]:
                     lookml_url += "?line=" + str(error["line_number"])
-            else:
-                lookml_url = None
 
             lookml_error = LookMLError(
                 model=error["model_id"],