diff --git a/app/js/controllers/controller-import.js b/app/js/controllers/controller-import.js
index d3beea0f..25985dda 100755
--- a/app/js/controllers/controller-import.js
+++ b/app/js/controllers/controller-import.js
@@ -52,7 +52,15 @@ angular.module('app').controller('ImportController', ['lodash', '$rootScope', '$
       throw 'builds must be an object!';
     }
     if (importData.comparisons) {
-      // TODO: check ship/builds exist for comparison
+      for (var compName in importData.comparisons) {
+        var comparison = importData.comparisons[compName];
+        for (var i = 0, l = comparison.builds.length; i < l; i++) {
+          var build = comparison.builds[i];
+          if (!importData.builds[build.shipId] || !importData.builds[build.shipId][build.buildName]) {
+            throw build.shipId + ' build "' + build.buildName + '" data is missing!';
+          }
+        }
+      }
       $scope.comparisons = importData.comparisons;
     }
     if (importData.discounts instanceof Array && importData.discounts.length == 2) {
diff --git a/test/tests/test-controller-import.js b/test/tests/test-controller-import.js
index 99dde417..fea84a41 100644
--- a/test/tests/test-controller-import.js
+++ b/test/tests/test-controller-import.js
@@ -85,6 +85,13 @@ describe('Import Controller', function() {
       expect(scope.jsonValid).toBeFalsy();
       expect(scope.errorMsg).toEqual('Imperial Clipper build "" must be a string at least 3 characters long!');
 
+      invalidImportData = angular.copy(importData);
+      invalidImportData.builds.asp = null;   // Remove Asp Miner build used in comparison
+      scope.importJSON = angular.toJson(invalidImportData);
+      scope.validateJson();
+      expect(scope.jsonValid).toBeFalsy();
+      expect(scope.errorMsg).toEqual('asp build "Miner" data is missing!');
+
     });
 
   });