diff --git a/src/Interpreters/Set.cpp b/src/Interpreters/Set.cpp
index b1e79602de92..2694ce8d893a 100644
--- a/src/Interpreters/Set.cpp
+++ b/src/Interpreters/Set.cpp
@@ -761,7 +761,17 @@ BoolMask MergeTreeSetIndex::checkInRange(const std::vector<Range> & key_ranges,
         }) - indices.begin();
 
     if (begin > end)
+    {
+        /// TODO: Remove the #ifndef and always throw after
+        ///       https://github.com/ClickHouse/ClickHouse/issues/90461 is fixed.
+        ///       (What happens here is: the applyMonotonicFunctionsChainToRange call above applies
+        ///        nonmonotonic functions, and we end up with left > right.)
+#ifndef NDEBUG
         throw Exception(ErrorCodes::LOGICAL_ERROR, "Invalid binary search result in MergeTreeSetIndex");
+#else
+        return {true, true};
+#endif
+    }
 
     bool can_be_true = begin < end;
 
diff --git a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
index 129af1d9697e..0f38c74d7cce 100644
--- a/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
+++ b/src/Storages/MergeTree/MergeTreeDataSelectExecutor.cpp
@@ -1715,11 +1715,17 @@ MarkRanges MergeTreeDataSelectExecutor::markRangesFromPKRange(
                         if (check_in_range(result_exact_range, BoolMask::consider_only_can_be_false).can_be_false)
                         {
                             /// key_condition.matchesExactContinuousRange returned true, but the
-                            /// range doesn't seem to be continuous.
+                            /// range doesn't seem to be continuous. Something's broken.
+                            /// TODO: Remove the #ifndef and always throw after
+                            ///       https://github.com/ClickHouse/ClickHouse/issues/90461 is fixed.
+#ifndef NDEBUG
                             throw Exception(ErrorCodes::LOGICAL_ERROR, "Inconsistent KeyCondition behavior");
+#endif
+                        }
+                        else
+                        {
+                            exact_ranges->emplace_back(std::move(result_exact_range));
                         }
-
-                        exact_ranges->emplace_back(std::move(result_exact_range));
                     }
                 }
             }