diff --git a/lib/services/schema-helper.service.ts b/lib/services/schema-helper.service.ts
index 7db1b1b2..be35f3b1 100644
--- a/lib/services/schema-helper.service.ts
+++ b/lib/services/schema-helper.service.ts
@@ -137,16 +137,16 @@ const injectors = {
     check: (propertySchema) => (propertySchema.type === 'integer' || propertySchema.type === 'number'),
     inject: (injectTo, propertySchema = injectTo) => {
       var range = '';
-      if (propertySchema.minimum != null && propertySchema.maximum != null) {
+      if (propertySchema.minimum != undefined && propertySchema.maximum != undefined) {
         range += propertySchema.exclusiveMinimum ? '( ' : '[ ';
         range += propertySchema.minimum;
         range += ' .. ';
         range += propertySchema.maximum;
         range += propertySchema.exclusiveMaximum ? ' )' : ' ]';
-      } else if (propertySchema.maximum != null) {
+      } else if (propertySchema.maximum != undefined) {
         range += propertySchema.exclusiveMaximum? '< ' : '<= ';
         range += propertySchema.maximum;
-      } else if (propertySchema.minimum != null) {
+      } else if (propertySchema.minimum != undefined) {
         range += propertySchema.exclusiveMinimum ? '> ' : '>= ';
         range += propertySchema.minimum;
       }
@@ -160,11 +160,11 @@ const injectors = {
     check: propertySchema => (propertySchema.type === 'string'),
     inject: (injectTo, propertySchema = injectTo) => {
       var range;
-      if (propertySchema.minLength != null && propertySchema.maxLength != null) {
+      if (propertySchema.minLength != undefined && propertySchema.maxLength != undefined) {
         range = `[ ${propertySchema.minLength} .. ${propertySchema.maxLength} ]`;
-      } else if (propertySchema.maxLength != null) {
+      } else if (propertySchema.maxLength != undefined) {
         range = '<= ' + propertySchema.maxLength;
-      } else if (propertySchema.minLength != null) {
+      } else if (propertySchema.minLength != undefined) {
         range = '>= ' + propertySchema.minLength;
       }
 
diff --git a/package.json b/package.json
index fcae6ed2..2cebb9e6 100644
--- a/package.json
+++ b/package.json
@@ -60,7 +60,7 @@
     "awesome-typescript-loader": "^2.2.1",
     "branch-release": "^1.0.3",
     "chalk": "^1.1.3",
-    "codelyzer": "^1.0.0-beta.0",
+    "codelyzer": "^1.0.0-beta.2",
     "copy-webpack-plugin": "^3.0.1",
     "core-js": "^2.4.1",
     "coveralls": "^2.11.9",