diff --git a/src/mol-model/structure/structure/unit/links/inter-compute.ts b/src/mol-model/structure/structure/unit/links/inter-compute.ts
index d96698455f54d48f84afac353ce4a7339c1aee8d..03184c454ff8674d8471d65f76c442721c166f30 100644
--- a/src/mol-model/structure/structure/unit/links/inter-compute.ts
+++ b/src/mol-model/structure/structure/unit/links/inter-compute.ts
@@ -139,8 +139,10 @@ function findPairLinks(unitA: Unit.Atomic, unitB: Unit.Atomic, params: LinkCompu
         }
     }
 
-    addMapEntry(map, unitA.id, new InterUnitBonds.UnitPairBonds(unitA, unitB, bondCount, state.bondedA.array, state.mapAB));
-    addMapEntry(map, unitB.id, new InterUnitBonds.UnitPairBonds(unitB, unitA, bondCount, state.bondedB.array, state.mapBA));
+    if (bondCount) {
+        addMapEntry(map, unitA.id, new InterUnitBonds.UnitPairBonds(unitA, unitB, bondCount, state.bondedA.array, state.mapAB));
+        addMapEntry(map, unitB.id, new InterUnitBonds.UnitPairBonds(unitB, unitA, bondCount, state.bondedB.array, state.mapBA));
+    }
 
     return bondCount;
 }