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-rw-r--r--lib/arel/table.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/arel/table.rb b/lib/arel/table.rb
index ac832ed2b3..58e0c46959 100644
--- a/lib/arel/table.rb
+++ b/lib/arel/table.rb
@@ -35,6 +35,8 @@ module Arel
end
def join relation, klass = Nodes::InnerJoin
+ return tm unless relation
+
sm = SelectManager.new(@engine)
case relation
when String, Nodes::SqlLiteral