diff --git a/src/operations/join_interface.jl b/src/operations/join_interface.jl
index 9127cba..31c1065 100644
--- a/src/operations/join_interface.jl
+++ b/src/operations/join_interface.jl
@@ -158,6 +158,11 @@ function _join(
 
     process_one_chunk =
         (type, l, r, cmp_l, cmp_r, other_r, lookup, r_sorted, l_sorted, r_unique) -> begin
+            # Variables below MUST be `local`: identifiers `inner_l`, `inner_r`, `outer_l`
+            # are also assigned in the enclosing `_join` body, so Julia's soft-scope rules
+            # would otherwise capture them by reference. Multiple `Dagger.@spawn`ed
+            # invocations of this closure would then race on the same binding cells.
+            local inner_l, inner_r, outer_l
             inner_l, inner_r = match_inner_indices(
                 l, r, cmp_l, cmp_r, lookup, r_sorted, l_sorted, r_unique
             )
diff --git a/test/table.jl b/test/table.jl
index bc05262..a337183 100644
--- a/test/table.jl
+++ b/test/table.jl
@@ -532,7 +532,7 @@ using OnlineStats
             @test isequal(lj1u, lj7)
             @test isequal(lj1, lj8)
             @test isequal(lj1, lj9)
-            # @test isequal(lj1, lj10)
+            @test isequal(lj1, lj10)
 
             ij1 = innerjoin(d1, d2, on=on)
             ij1u = innerjoin(d1, unique(d2, r_colsymbols), on=on)
@@ -557,7 +557,7 @@ using OnlineStats
             @test isequal(ij1u, ij7)
             @test isequal(ij1, ij8)
             @test isequal(ij1, ij9)
-            # @test isequal(ij1, ij10)
+            @test isequal(ij1, ij10)
             @test isequal(ij1, ij11)
         end
     end