diff --git a/dom/icc/IccCallback.cpp b/dom/icc/IccCallback.cpp
index 956559919ea..ad66f44ffff 100644
--- a/dom/icc/IccCallback.cpp
+++ b/dom/icc/IccCallback.cpp
@@ -38,7 +38,10 @@ IccContactToMozContact(JSContext* aCx, GlobalObject& aGlobal,
   if (count > 0) {
     Sequence<nsString>& nameSeq = properties.mName.Construct().SetValue();
     for (uint32_t i = 0; i < count; i++) {
-      nameSeq.AppendElement(nsDependentString(rawStringArray[i]), fallible);
+      nameSeq.AppendElement(
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : EmptyString(),
+        fallible);
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
   }
@@ -52,7 +55,9 @@ IccContactToMozContact(JSContext* aCx, GlobalObject& aGlobal,
     Sequence<ContactTelField>& numberSeq = properties.mTel.Construct().SetValue();
     for (uint32_t i = 0; i < count; i++) {
       ContactTelField number;
-      number.mValue.Construct() = nsDependentString(rawStringArray[i]);
+      number.mValue.Construct() =
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : EmptyString();
       numberSeq.AppendElement(number, fallible);
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
@@ -67,7 +72,9 @@ IccContactToMozContact(JSContext* aCx, GlobalObject& aGlobal,
     Sequence<ContactField>& emailSeq = properties.mEmail.Construct().SetValue();
     for (uint32_t i = 0; i < count; i++) {
       ContactField email;
-      email.mValue.Construct() = nsDependentString(rawStringArray[i]);
+      email.mValue.Construct() =
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : EmptyString();
       emailSeq.AppendElement(email, fallible);
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
diff --git a/dom/icc/IccContact.cpp b/dom/icc/IccContact.cpp
index 300ac1db041..7ec035f7ed6 100644
--- a/dom/icc/IccContact.cpp
+++ b/dom/icc/IccContact.cpp
@@ -129,6 +129,11 @@ NS_IMETHODIMP IccContact::Get##_field(uint32_t* aCount, char16_t*** a##_field)
     return NS_ERROR_OUT_OF_MEMORY;                                              \
   }                                                                             \
   for (uint32_t i = 0; i < count; i++) {                                        \
+    if(m##_field[i].IsVoid()) {                                                 \
+      (temp)[i] = nullptr;                                                      \
+      continue;                                                                 \
+    }                                                                           \
+                                                                                \
     (temp)[i] = ToNewUnicode(m##_field[i]);                                     \
     if (!(temp)[i]) {                                                           \
       NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(i, temp);                           \
diff --git a/dom/icc/gonk/IccService.js b/dom/icc/gonk/IccService.js
index 176952b7045..953c0ec73a7 100644
--- a/dom/icc/gonk/IccService.js
+++ b/dom/icc/gonk/IccService.js
@@ -86,13 +86,8 @@ function IccContact(aContact) {
   this._numbers = [];
   this._emails = [];
 
-  if (aContact.alphaId) {
-    this._names.push(aContact.alphaId);
-  }
-
-  if (aContact.number) {
-    this._numbers.push(aContact.number);
-  }
+  this._names.push(aContact.alphaId);
+  this._numbers.push(aContact.number);
 
   let anrLen = aContact.anr ? aContact.anr.length : 0;
   for (let i = 0; i < anrLen; i++) {
diff --git a/dom/icc/ipc/IccIPCUtils.cpp b/dom/icc/ipc/IccIPCUtils.cpp
index 850019ca886..c311c22a8ff 100644
--- a/dom/icc/ipc/IccIPCUtils.cpp
+++ b/dom/icc/ipc/IccIPCUtils.cpp
@@ -51,7 +51,9 @@ IccIPCUtils::GetIccContactDataFromIccContact(nsIIccContact* aContact,
   NS_ENSURE_SUCCESS_VOID(rv);
   if (count > 0) {
     for (uint32_t i = 0; i < count; i++) {
-      aOutData.names().AppendElement(nsDependentString(rawStringArray[i]));
+      aOutData.names().AppendElement(
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : NullString());
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
   }
@@ -63,7 +65,9 @@ IccIPCUtils::GetIccContactDataFromIccContact(nsIIccContact* aContact,
   NS_ENSURE_SUCCESS_VOID(rv);
   if (count > 0) {
     for (uint32_t i = 0; i < count; i++) {
-      aOutData.numbers().AppendElement(nsDependentString(rawStringArray[i]));
+      aOutData.numbers().AppendElement(
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : NullString());
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
   }
@@ -75,7 +79,9 @@ IccIPCUtils::GetIccContactDataFromIccContact(nsIIccContact* aContact,
   NS_ENSURE_SUCCESS_VOID(rv);
   if (count > 0) {
     for (uint32_t i = 0; i < count; i++) {
-      aOutData.emails().AppendElement(nsDependentString(rawStringArray[i]));
+      aOutData.emails().AppendElement(
+        rawStringArray[i] ? nsDependentString(rawStringArray[i])
+                          : NullString());
     }
     NS_FREE_XPCOM_ALLOCATED_POINTER_ARRAY(count, rawStringArray);
   }
diff --git a/dom/system/gonk/ril_worker.js b/dom/system/gonk/ril_worker.js
index 307bfde631c..3732e074abb 100644
--- a/dom/system/gonk/ril_worker.js
+++ b/dom/system/gonk/ril_worker.js
@@ -8689,7 +8689,7 @@ ICCPDUHelperObject.prototype = {
    *                    0xff.
    * @param str         String to be written. Could be null.
    *
-   * @return The string has been written into Buf.
+   * @return The string has been written into Buf. "" if str is null.
    */
   writeStringTo8BitUnpacked: function(numOctets, str) {
     const langTable = PDU_NL_LOCKING_SHIFT_TABLES[PDU_NL_IDENTIFIER_DEFAULT];
@@ -8729,7 +8729,7 @@ ICCPDUHelperObject.prototype = {
       GsmPDUHelper.writeHexOctet(0xff);
     }
 
-    return (str) ? str.substring(0, i) : null;
+    return (str) ? str.substring(0, i) : "";
   },
 
   /**
@@ -9090,7 +9090,7 @@ ICCPDUHelperObject.prototype = {
    */
   writeAlphaIdentifier: function(numOctets, alphaId) {
     if (numOctets === 0) {
-      return null;
+      return "";
     }
 
     // If alphaId is empty or it's of GSM 8 bit.
@@ -9222,7 +9222,7 @@ ICCPDUHelperObject.prototype = {
       for (let i = 0; i < ADN_MAX_BCD_NUMBER_BYTES + 1; i++) {
         GsmPDUHelper.writeHexOctet(0xff);
       }
-      return null;
+      return "";
     }
   }
 };