diff --git a/src/region/dynamic_channel_plans/mod.rs b/src/region/dynamic_channel_plans/mod.rs
index 00f9a5d..33f545a 100644
--- a/src/region/dynamic_channel_plans/mod.rs
+++ b/src/region/dynamic_channel_plans/mod.rs
@@ -55,7 +55,12 @@ impl<
         if channel < NUM_JOIN_CHANNELS {
             Some(R::join_channels()[channel])
         } else {
-            self.additional_channels[channel - NUM_JOIN_CHANNELS]
+            let index = channel - NUM_JOIN_CHANNELS;
+            if index < self.additional_channels.len() {
+                self.additional_channels[index]
+            } else {
+                None
+            }
         }
     }