diff --git a/lib/session.js b/lib/session.js
index 50eb6c0..a724979 100644
--- a/lib/session.js
+++ b/lib/session.js
@@ -69,7 +69,13 @@ function session(sock) {
 			return;
 		}
 
-		log.verbose('larvitsmpp: lib/session.js: session() - sockWrite() - sending PDU. SeqNr: ' + pdu.readUInt32BE(12) + ' cmd: ' + defs.cmdsById[pdu.readUInt32BE(4)].command + ' cmdStatus: ' + defs.errorsById[parseInt(pdu.readUInt32BE(8))] + ' hex: ' + pdu.toString('hex'));
+		try {
+			log.verbose('larvitsmpp: lib/session.js: session() - sockWrite() - sending PDU. SeqNr: ' + pdu.readUInt32BE(12) + ' cmd: ' + defs.cmdsById[pdu.readUInt32BE(4)].command + ' cmdStatus: ' + defs.errorsById[parseInt(pdu.readUInt32BE(8))] + ' hex: ' + pdu.toString('hex'));
+		} catch (e) {
+			log.error('larvitsmpp: lib/session.js: session() - sockWrite() - PDU buffer is invalid. Buffer hex: "' + pdu.toString('hex') + '"');
+			return;
+		}
+
 		sock.write(pdu);
 
 		if (closeAfterSend) {
diff --git a/lib/utils.js b/lib/utils.js
index be31219..a8b0bbc 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -218,15 +218,24 @@ function objToPdu(obj, callback) {
 
 	// Used to write buffer once the command length is known
 	function writeBuffer() {
-		var offset = 16; // Start the offset on the body
+		var offset = 16, // Start the offset on the body
+		    err;
+
 
 		buff = new Buffer(cmdLength);
 
 		// Write PDU header
-		buff.writeUInt32BE(cmdLength, 0);                  // Command length for the first 4 octets
-		buff.writeUInt32BE(defs.cmds[obj.cmdName].id, 4);  // Command id for the second 4 octets
-		buff.writeUInt32BE(defs.errors[obj.cmdStatus], 8); // Command status for the third 4 octets
-		buff.writeUInt32BE(seqNr, 12);                     // Sequence number as the fourth 4 octets
+		try {
+			buff.writeUInt32BE(cmdLength, 0);                  // Command length for the first 4 octets
+			buff.writeUInt32BE(defs.cmds[obj.cmdName].id, 4);  // Command id for the second 4 octets
+			buff.writeUInt32BE(defs.errors[obj.cmdStatus], 8); // Command status for the third 4 octets
+			buff.writeUInt32BE(seqNr, 12);                     // Sequence number as the fourth 4 octets
+		} catch (e) {
+			err = new Error('Could not write PDU header, catched err: ' + e.message, obj);
+			log.error('larvitsmpp: lib/utils.js: objToPdu() - writeBuffer() - ' + err.message);
+			callback(err);
+			return;
+		}
 
 		// Cycle through the defs list to make sure the params are in the right order
 		for (param in defs.cmds[obj.cmdName].params) {
@@ -315,7 +324,9 @@ function objToPdu(obj, callback) {
 
 	calcCmdLength();
 	writeBuffer();
-	callback(null, buff);
+	if (buff) {
+		callback(null, buff);
+	}
 }
 
 /**