diff --git a/beat/editor/widgets/toolchaineditor.py b/beat/editor/widgets/toolchaineditor.py
index e5826b2bfdd5563bdf95f6464d0be4056e8b6790..2c190daa914e3e34ca412214ac65174f539b87b6 100644
--- a/beat/editor/widgets/toolchaineditor.py
+++ b/beat/editor/widgets/toolchaineditor.py
@@ -340,13 +340,25 @@ class Connection(QGraphicsPathItem):
         self.end_pin_name = connection_details["to"].split(".")[1]
         self.channel = connection_details["channel"]
 
-        hexadecimal = channel_colors[self.channel].lstrip("#")
-        hlen = len(hexadecimal)
-        self.connection_color = list(
-            int(hexadecimal[i : i + hlen // 3], 16) for i in range(0, hlen, hlen // 3)
-        )
-        self.connection_color.append(255)
-        self.connection_pen.setColor(QColor(*self.connection_color))
+        if self.channel is None or self.channel not in channel_colors:
+            warning = QMessageBox()
+            warning.setIcon(QMessageBox.Warning)
+            warning.setWindowTitle(toolchain.tr("Connection creation"))
+            warning.setInformativeText(
+                toolchain.tr("No dataset synchronization channel connection found!")
+            )
+            warning.setStandardButtons(QMessageBox.Ok)
+            warning.exec_()
+
+        else:
+            hexadecimal = channel_colors[self.channel].lstrip("#")
+            hlen = len(hexadecimal)
+            self.connection_color = list(
+                int(hexadecimal[i : i + hlen // 3], 16)
+                for i in range(0, hlen, hlen // 3)
+            )
+            self.connection_color.append(255)
+            self.connection_pen.setColor(QColor(*self.connection_color))
 
         self.blocks = toolchain.blocks