diff --git a/rfc8416.php b/rfc8416.php
index 5ac47c7..e93357d 100755
--- a/rfc8416.php
+++ b/rfc8416.php
@@ -103,13 +103,16 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV6_AS0);
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
+    // Catch if ASN is actually an integer and larger than zero
+    if (strlen ($_asn[0]) > 0 && strlen ($_prefix) > 0) {
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV6_AS0);
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
 
-    $k++;
+      $k++;
+    }
   }
 }
 
@@ -203,13 +206,16 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV4_AS0);
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
-    $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
+    // Catch if ASN is actually an integer and larger than zero
+    if (strlen ($_asn[0]) > 0 && strlen ($_prefix) > 0) {
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["asn"] = trim ($_asn[0], "AS");
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["prefix"] = $_prefix;
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["maxPrefixLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV4_AS0);
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["source"] = "$_ta";
+      $roas["locallyAddedAssertions"]["prefixAssertions"][$k]["mnt-by"] = "$_mnt";
 
-    $k++;
+      $k++;
+    }
   }
 }
 
diff --git a/roagen.php b/roagen.php
index 74df7f5..fb779f0 100755
--- a/roagen.php
+++ b/roagen.php
@@ -97,15 +97,18 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
-    $roas["roas"][$k]["prefix"] = $_prefix;
-    $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV6_AS0);
-    //$roas["roas"][$k]["url"]["inetnum"] = "$web_registry_url/data/inet6num/$prefix[1]_$prefix[2]";
-    //$roas["roas"][$k]["url"]["route"] = "$web_registry_url/data/route6/$prefix[1]_$prefix[2]";
-    $roas["roas"][$k]["ta"] = $_ta;
-    $roas["roas"][$k]["mnt-by"] = $_mnt;
+    // Catch if ASN is actually an integer and larger than zero
+    if (strlen ($_asn[0]) > 0 && strlen ($_prefix) > 0) {
+      $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
+      $roas["roas"][$k]["prefix"] = $_prefix;
+      $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV6_AS0);
+      //$roas["roas"][$k]["url"]["inetnum"] = "$web_registry_url/data/inet6num/$prefix[1]_$prefix[2]";
+      //$roas["roas"][$k]["url"]["route"] = "$web_registry_url/data/route6/$prefix[1]_$prefix[2]";
+      $roas["roas"][$k]["ta"] = $_ta;
+      $roas["roas"][$k]["mnt-by"] = $_mnt;
 
-    $k++;
+      $k++;
+    }
   }
 }
 
@@ -199,15 +202,18 @@ foreach ($raw_array as $sub_array)
     // Extract ASxxxxx from string.
     preg_match ("/AS[0-9]+/", explode (":", $asn)[1], $_asn);
 
-    $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
-    $roas["roas"][$k]["prefix"] = $_prefix;
-    $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV4_AS0);
-    //$roas["roas"][$k]["url"]["inetnum"] = "$web_registry_url/data/inetnum/$prefix[1]_$prefix[2]";
-    //$roas["roas"][$k]["url"]["route"] = "$web_registry_url/data/route/$prefix[1]_$prefix[2]";
-    $roas["roas"][$k]["ta"] = $_ta;
-    $roas["roas"][$k]["mnt-by"] = $_mnt;
+    // Catch if ASN is actually an integer and larger than zero
+    if (strlen ($_asn[0]) > 0 && strlen ($_prefix) > 0) {
+      $roas["roas"][$k]["asn"] = trim ($_asn[0], "AS");
+      $roas["roas"][$k]["prefix"] = $_prefix;
+      $roas["roas"][$k]["maxLength"] = ($_asn[0] != "AS0" ? $_maxlength : MAX_LEN_IPV4_AS0);
+      //$roas["roas"][$k]["url"]["inetnum"] = "$web_registry_url/data/inetnum/$prefix[1]_$prefix[2]";
+      //$roas["roas"][$k]["url"]["route"] = "$web_registry_url/data/route/$prefix[1]_$prefix[2]";
+      $roas["roas"][$k]["ta"] = $_ta;
+      $roas["roas"][$k]["mnt-by"] = $_mnt;
 
-    $k++;
+      $k++;
+    }
   }
 }