diff --git a/lib/figlet.js b/lib/figlet.js
index ddd110f..4c88fa5 100644
--- a/lib/figlet.js
+++ b/lib/figlet.js
@@ -896,13 +896,17 @@ var figlet = figlet || (function() {
         if (typeof options.horizontalLayout !== 'undefined') {
             params = getHorizontalFittingRules(options.horizontalLayout, fontOpts);
             for (prop in params) {
-                myOpts.fittingRules[prop] = params[prop];
+                if (params.hasOwnProperty(prop)) {
+                    myOpts.fittingRules[prop] = params[prop];
+                }
             }
         }
         if (typeof options.verticalLayout !== 'undefined') {
             params = getVerticalFittingRules(options.verticalLayout, fontOpts);
             for (prop in params) {
-                myOpts.fittingRules[prop] = params[prop];
+                if (params.hasOwnProperty(prop)) {
+                    myOpts.fittingRules[prop] = params[prop];
+                }
             }
         }
         myOpts.printDirection = (typeof options.printDirection !== 'undefined') ? options.printDirection : fontOpts.printDirection;
@@ -1131,7 +1135,9 @@ var figlet = figlet || (function() {
             });
         }, Promise.resolve()).then(function(res){
             for(var i in fonts){
-                me.parseFont(fonts[i], fontData[i]);
+                if (fonts.hasOwnProperty(i)) {
+                    me.parseFont(fonts[i], fontData[i]);
+                }
             }
 
             if(next)next();