Merging upstream version 18.3.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/sqlglot/dialects/postgres.py b/sqlglot/dialects/postgres.py
index c26e121..5027013 100644
--- a/sqlglot/dialects/postgres.py
+++ b/sqlglot/dialects/postgres.py
@@ -190,7 +190,11 @@ def _remove_target_from_merge(expression: exp.Expression) -> exp.Expression:
     if isinstance(expression, exp.Merge):
         alias = expression.this.args.get("alias")
 
-        normalize = lambda identifier: Postgres.normalize_identifier(identifier).name
+        normalize = (
+            lambda identifier: Postgres.normalize_identifier(identifier).name
+            if identifier
+            else None
+        )
 
         targets = {normalize(expression.this.this)}