diff --git a/kasmweb/core/decoders/raw.js b/kasmweb/core/decoders/raw.js
index 4d84d7d..f47300f 100644
--- a/kasmweb/core/decoders/raw.js
+++ b/kasmweb/core/decoders/raw.js
@@ -13,6 +13,10 @@ export default class RawDecoder {
     }
 
     decodeRect(x, y, width, height, sock, display, depth) {
+        if ((width === 0) || (height === 0)) {
+            return true;
+        }
+
         if (this._lines === 0) {
             this._lines = height;
         }
diff --git a/kasmweb/tests/test.copyrect.js b/kasmweb/tests/test.copyrect.js
index afb778f..20abc7e 100644
--- a/kasmweb/tests/test.copyrect.js
+++ b/kasmweb/tests/test.copyrect.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }
diff --git a/kasmweb/tests/test.hextile.js b/kasmweb/tests/test.hextile.js
index bac415f..4d41dc9 100644
--- a/kasmweb/tests/test.hextile.js
+++ b/kasmweb/tests/test.hextile.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }
diff --git a/kasmweb/tests/test.raw.js b/kasmweb/tests/test.raw.js
index 4830bbb..71a2b87 100644
--- a/kasmweb/tests/test.raw.js
+++ b/kasmweb/tests/test.raw.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }
diff --git a/kasmweb/tests/test.rre.js b/kasmweb/tests/test.rre.js
index 583cd5a..48ef844 100644
--- a/kasmweb/tests/test.rre.js
+++ b/kasmweb/tests/test.rre.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }
diff --git a/kasmweb/tests/test.tight.js b/kasmweb/tests/test.tight.js
index 4aa47d7..cc5db36 100644
--- a/kasmweb/tests/test.tight.js
+++ b/kasmweb/tests/test.tight.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }
diff --git a/kasmweb/tests/test.tightpng.js b/kasmweb/tests/test.tightpng.js
index 857cd84..cb36e99 100644
--- a/kasmweb/tests/test.tightpng.js
+++ b/kasmweb/tests/test.tightpng.js
@@ -17,7 +17,13 @@ function testDecodeRect(decoder, x, y, width, height, data, display, depth) {
         decoder.decodeRect(x, y, width, height, sock, display, depth);
     });
 
-    sock._websocket._receiveData(new Uint8Array(data));
+    // Empty messages are filtered at multiple layers, so we need to
+    // do a direct call
+    if (data.length === 0) {
+        decoder.decodeRect(x, y, width, height, sock, display, depth);
+    } else {
+        sock._websocket._receiveData(new Uint8Array(data));
+    }
 
     display.flip();
 }