diff --git a/javascript/i18n/phonenumbers/demo-compiled.js b/javascript/i18n/phonenumbers/demo-compiled.js
index 68be9d056..1ec1a2408 100644
--- a/javascript/i18n/phonenumbers/demo-compiled.js
+++ b/javascript/i18n/phonenumbers/demo-compiled.js
@@ -431,9 +431,9 @@ B:"2",C:"2",D:"3",E:"3",F:"3",G:"4",H:"4",I:"4",J:"5",K:"5",L:"5",M:"6",N:"6",O:
 function O(a,b){for(var c=new C,d,e=a.length,f=0;f<e;++f)d=a.charAt(f),d=b[d.toUpperCase()],null!=d&&c.a(d);return c.toString()}function mb(a){return null!=a&&isNaN(a)&&a.toUpperCase()in Pa}function P(a,b,c){if(0==u(b,2)&&t(b,5)){var d=y(b,5);if(0<d.length)return d}var d=y(b,1),e=Q(b);if(0==c)return R(d,0,e,"");if(!(d in J))return e;a=S(a,d,T(d));b=nb(b,a,c);e=ob(e,a,c);return R(d,c,e,b)}
 function pb(a,b,c){var d=y(b,1),e=Q(b);if(!(d in J))return e;a=S(a,d,T(d));b=nb(b,a,2);c=ob(e,a,2,c);return R(d,2,c,b)}function S(a,b,c){return"001"==c?U(a,""+b):U(a,c)}
 function qb(a,b,c){if(!mb(c))return P(a,b,1);var d=y(b,1),e=Q(b);if(!(d in J))return e;if(1==d){if(null!=c&&0<=p(J[1],c.toUpperCase()))return d+" "+P(a,b,2)}else if(d==rb(a,c))return P(a,b,2);var f=U(a,c),g=y(f,11);c="";N(Sa,g)?c=g:t(f,17)&&(c=y(f,17));a=S(a,d,T(d));e=ob(e,a,1);b=nb(b,a,1);return 0<c.length?c+" "+d+" "+e+b:R(d,1,e,b)}
-function sb(a,b,c){var d;if(d=t(b,5)){if(d=t(b,4))d=y(b,1),d=S(a,d,T(d)),d=!(d&&y(d,26));if(!d){d=y(b,1);if(d=S(a,d,T(d))){var e=Q(b);d=!!tb(w(d,19),e)}else d=!1;d=!d}}if(d)return y(b,5);if(!t(b,6))return P(a,b,2);switch(u(b,6)){case 1:a=P(a,b,1);break;case 5:a=qb(a,b,c);break;case 10:a=P(a,b,1).substring(1);break;default:d=T(y(b,1));var f;(c=U(a,d))?(c=y(c,12),f=c.length?c=c.replace("~",""):null):f=null;c=P(a,b,2);if(null!=f&&f.length){var g;a:{e=y(b,5);e=O(e,L);if(!e.lastIndexOf(f,0))try{g=ub(a,
-vb(a,e.substring(f.length),d,!1));break a}catch(h){}g=!1}if(g)a=c;else if(g=U(a,d),d=Q(b),g=tb(w(g,19),d))if(d=y(g,4),e=d.indexOf("$1"),0>=e)a=c;else if(d=d.substring(0,e),d=O(d,L),d.length)if(g=g.clone(),Ga(g,4),d=[g],g=y(b,1),c=Q(b),g in J){a=S(a,g,T(g));if(e=tb(d,c))d=e.clone(),e=y(e,4),0<e.length&&(f=y(a,12),0<f.length?(e=e.replace(bb,f).replace(cb,"$1"),v(d,4,e)):Ga(d,4)),c=wb(c,d,2);a=nb(b,a,2);a=R(g,2,c,a)}else a=c;else a=c;else a=c}else a=c}b=y(b,5);null!=a&&0<b.length&&(g=O(a,Qa),c=O(b,Qa),
-g!=c&&(a=b));return a}function Q(a){var b=""+u(a,2);return t(a,4)&&u(a,4)&&0<y(a,8)?Array(y(a,8)+1).join("0")+b:b}function R(a,b,c,d){switch(b){case 0:return"+"+a+c+d;case 1:return"+"+a+" "+c+d;case 3:return"tel:+"+a+"-"+c+d;default:return c+d}}function ob(a,b,c,d){b=w(b,20).length&&2!=c?w(b,20):w(b,19);return(b=tb(b,a))?wb(a,b,c,d):a}function tb(a,b){for(var c,d=a.length,e=0;e<d;++e){c=a[e];var f=z(c,3);if(!f||!b.search(u(c,3,f-1)))if(f=new RegExp(u(c,1)),N(f,b))return c}return null}
+function sb(a,b,c){var d;if(d=t(b,5)){d=y(b,1);if(d=S(a,d,T(d))){var e=Q(b);d=!!tb(w(d,19),e)}else d=!1;d=!d}if(d)return y(b,5);if(!t(b,6))return P(a,b,2);switch(u(b,6)){case 1:a=P(a,b,1);break;case 5:a=qb(a,b,c);break;case 10:a=P(a,b,1).substring(1);break;default:d=T(y(b,1));var f;(c=U(a,d))?(c=y(c,12),f=c.length?c=c.replace("~",""):null):f=null;c=P(a,b,2);if(null!=f&&f.length){var g;a:{e=y(b,5);e=O(e,L);if(!e.lastIndexOf(f,0))try{g=ub(a,vb(a,e.substring(f.length),d,!1));break a}catch(h){}g=!1}if(g)a=
+c;else if(g=U(a,d),d=Q(b),g=tb(w(g,19),d))if(d=y(g,4),e=d.indexOf("$1"),0>=e)a=c;else if(d=d.substring(0,e),d=O(d,L),d.length)if(g=g.clone(),Ga(g,4),d=[g],g=y(b,1),c=Q(b),g in J){a=S(a,g,T(g));if(e=tb(d,c))d=e.clone(),e=y(e,4),0<e.length&&(f=y(a,12),0<f.length?(e=e.replace(bb,f).replace(cb,"$1"),v(d,4,e)):Ga(d,4)),c=wb(c,d,2);a=nb(b,a,2);a=R(g,2,c,a)}else a=c;else a=c;else a=c}else a=c}b=y(b,5);null!=a&&0<b.length&&(g=O(a,Qa),c=O(b,Qa),g!=c&&(a=b));return a}
+function Q(a){if(!t(a,2))return"";var b=""+u(a,2);return t(a,4)&&u(a,4)&&0<y(a,8)?Array(y(a,8)+1).join("0")+b:b}function R(a,b,c,d){switch(b){case 0:return"+"+a+c+d;case 1:return"+"+a+" "+c+d;case 3:return"tel:+"+a+"-"+c+d;default:return c+d}}function ob(a,b,c,d){b=w(b,20).length&&2!=c?w(b,20):w(b,19);return(b=tb(b,a))?wb(a,b,c,d):a}function tb(a,b){for(var c,d=a.length,e=0;e<d;++e){c=a[e];var f=z(c,3);if(!f||!b.search(u(c,3,f-1)))if(f=new RegExp(u(c,1)),N(f,b))return c}return null}
 function wb(a,b,c,d){var e=y(b,2),f=new RegExp(u(b,1)),g=y(b,5);2==c&&null!=d&&0<d.length&&0<g.length?(b=g.replace(db,d),e=e.replace(ab,b),a=a.replace(f,e)):(b=y(b,4),a=2==c&&null!=b&&0<b.length?a.replace(f,e.replace(ab,b)):a.replace(f,e));3==c&&(a=a.replace(RegExp("^[-x\u2010-\u2015\u2212\u30fc\uff0d-\uff0f \u00a0\u00ad\u200b\u2060\u3000()\uff08\uff09\uff3b\uff3d.\\[\\]/~\u2053\u223c\uff5e]+"),""),a=a.replace(RegExp("[-x\u2010-\u2015\u2212\u30fc\uff0d-\uff0f \u00a0\u00ad\u200b\u2060\u3000()\uff08\uff09\uff3b\uff3d.\\[\\]/~\u2053\u223c\uff5e]+",
 "g"),"-"));return a}function nb(a,b,c){return t(a,3)&&u(a,3).length?3==c?";ext="+u(a,3):t(b,13)?u(b,13)+y(a,3):" ext. "+y(a,3):""}function xb(a,b){switch(b){case 4:return u(a,5);case 3:return u(a,4);case 1:return u(a,3);case 0:case 2:return u(a,2);case 5:return u(a,6);case 6:return u(a,8);case 7:return u(a,7);case 8:return u(a,21);case 9:return u(a,25);case 10:return u(a,28);default:return u(a,1)}}
 function yb(a,b){return W(a,u(b,1))?W(a,u(b,5))?4:W(a,u(b,4))?3:W(a,u(b,6))?5:W(a,u(b,8))?6:W(a,u(b,7))?7:W(a,u(b,21))?8:W(a,u(b,25))?9:W(a,u(b,28))?10:W(a,u(b,2))?u(b,18)||W(a,u(b,3))?2:0:!u(b,18)&&W(a,u(b,3))?1:-1:-1}function U(a,b){if(null==b)return null;b=b.toUpperCase();var c=a.a[b];if(!c){c=Pa[b];if(!c)return null;c=(new H).f(G.h(),c);a.a[b]=c}return c}function W(a,b){var c=a.length;return 0<z(b,9)&&-1==p(w(b,9),c)?!1:N(y(b,2),a)}function ub(a,b){var c=zb(a,b);return Ab(a,b,c)}
diff --git a/javascript/i18n/phonenumbers/phonenumberutil.js b/javascript/i18n/phonenumbers/phonenumberutil.js
index 148ea5cc5..702341f15 100644
--- a/javascript/i18n/phonenumbers/phonenumberutil.js
+++ b/javascript/i18n/phonenumbers/phonenumberutil.js
@@ -2430,10 +2430,16 @@ i18n.phonenumbers.PhoneNumberUtil.prototype.
 i18n.phonenumbers.PhoneNumberUtil.prototype.getNationalSignificantNumber =
     function(number) {
 
-  // If leading zero(s) have been set, we prefix this now. Note this is not a
-  // national prefix.
+  if (!number.hasNationalNumber()) {
+    return '';
+  }
   /** @type {string} */
   var nationalNumber = '' + number.getNationalNumber();
+  // If leading zero(s) have been set, we prefix this now. Note that a single
+  // leading zero is not the same as a national prefix; leading zeros should be
+  // dialled no matter whether you are dialling from within or outside the
+  // country, national prefixes are added when formatting nationally if
+  // applicable.
   if (number.hasItalianLeadingZero() && number.getItalianLeadingZero() &&
       number.getNumberOfLeadingZerosOrDefault() > 0) {
     return Array(number.getNumberOfLeadingZerosOrDefault() + 1).join('0') +
diff --git a/javascript/i18n/phonenumbers/phonenumberutil_test.js b/javascript/i18n/phonenumbers/phonenumberutil_test.js
index 00d2903c0..079cd9e50 100644
--- a/javascript/i18n/phonenumbers/phonenumberutil_test.js
+++ b/javascript/i18n/phonenumbers/phonenumberutil_test.js
@@ -492,6 +492,11 @@ function testGetNationalSignificantNumber() {
 
   assertEquals('12345678',
       phoneUtil.getNationalSignificantNumber(INTERNATIONAL_TOLL_FREE));
+
+  // An empty number.
+  /** @type {i18n.phonenumbers.PhoneNumber} */
+  var emptyNumber = new i18n.phonenumbers.PhoneNumber();
+  assertEquals('', phoneUtil.getNationalSignificantNumber(emptyNumber));
 }
 
 function testGetNationalSignificantNumber_ManyLeadingZeros() {
diff --git a/pending_code_changes.txt b/pending_code_changes.txt
index ff9abe09e..08e1a6572 100644
--- a/pending_code_changes.txt
+++ b/pending_code_changes.txt
@@ -7,3 +7,5 @@ Code changes:
    digits inadvertently. Now this is checked at the end of the method anyway.
    However slight formatting differences with this method on invalid numbers
    starting with 0s may be noticed in some countries.
+ - Bug fix for Javascript: getNationalSignificantNumber used to print the string
+   "null" for empty phone number objects, now it returns an empty string.