diff --git a/halo2-base/src/gates/circuit/builder.rs b/halo2-base/src/gates/circuit/builder.rs
index f882426e..980abee9 100644
--- a/halo2-base/src/gates/circuit/builder.rs
+++ b/halo2-base/src/gates/circuit/builder.rs
@@ -343,6 +343,11 @@ impl<F: ScalarField> BaseCircuitBuilder<F> {
                     let cell = advice[0].cell.as_ref().unwrap();
                     let copy_manager = self.core.copy_manager.lock().unwrap();
                     let acell = copy_manager.assigned_advices[cell];
+                    assert_eq!(
+                        acell.column,
+                        config.gate.basic_gates[phase][0].value.into(),
+                        "lookup column does not match"
+                    );
                     q_lookup.enable(region, acell.row_offset).unwrap();
                 }
             }
diff --git a/halo2-base/src/gates/range/mod.rs b/halo2-base/src/gates/range/mod.rs
index 3e5b5dfe..79cdf155 100644
--- a/halo2-base/src/gates/range/mod.rs
+++ b/halo2-base/src/gates/range/mod.rs
@@ -78,8 +78,9 @@ impl<F: ScalarField> RangeConfig<F> {
         for (phase, &num_columns) in num_lookup_advice.iter().enumerate() {
             let num_advice = *gate_params.num_advice_per_phase.get(phase).unwrap_or(&0);
             let mut columns = Vec::new();
-            // if num_columns is set to 0, then we assume you do not want to perform any lookups in that phase
-            if num_advice == 1 && num_columns != 0 {
+            // If num_columns is set to 0, then we assume you do not want to perform any lookups in that phase.
+            // Disable this optimization in phase > 0 because you might set selectors based a cell from other columns.
+            if phase == 0 && num_advice == 1 && num_columns != 0 {
                 q_lookup.push(Some(meta.complex_selector()));
             } else {
                 q_lookup.push(None);