diff --git a/lib/core/Manager.js b/lib/core/Manager.js
index 9036cc7a..4bb37e3c 100644
--- a/lib/core/Manager.js
+++ b/lib/core/Manager.js
@@ -181,7 +181,8 @@ Manager.prototype.areCompatible = function (candidate, resolved) {
         highestCandidate = this._getCap(semver.toComparators(candidate.target), 'highest');
         highestResolved = this._getCap(semver.toComparators(resolved.target), 'highest');
 
-        return semver.eq(highestCandidate.version, highestResolved.version) &&
+        return highestResolved.version && highestResolved.version &&
+               semver.eq(highestCandidate.version, highestResolved.version) &&
                highestCandidate.comparator === highestResolved.comparator &&
                semver.satisfies(resolvedVersion, candidate.target);
     }