diff --git a/examples/badchannel.txt b/examples/badchannel.txt
new file mode 100644
index 000000000..1de3c6eb6
--- /dev/null
+++ b/examples/badchannel.txt
@@ -0,0 +1,6 @@
+0
+10, 30
+40:45 50:52
+1279
+# all bad channels are applied for all counters in deector
+
diff --git a/slsDetectorSoftware/src/DetectorImpl.cpp b/slsDetectorSoftware/src/DetectorImpl.cpp
index 3fd077cd8..bfc371e9e 100644
--- a/slsDetectorSoftware/src/DetectorImpl.cpp
+++ b/slsDetectorSoftware/src/DetectorImpl.cpp
@@ -1794,20 +1794,23 @@ void DetectorImpl::setBadChannels(const std::string &fname, Positions pos) {
                                    " out of bounds.");
             }
             int ch = badchannel % nchan;
-            int imod = badchannel / nchan;
-            if (imod >= (int)modules.size()) {
+            size_t imod = badchannel / nchan;
+            if (imod >= modules.size()) {
                 throw RuntimeError("Invalid bad channel list. " +
                                    std::to_string(badchannel) +
                                    " out of bounds.");
             }
-
-            if ((int)badchannels.size() != imod + 1) {
+            if (badchannels.size() != imod + 1) {
                 badchannels.push_back(std::vector<int>{});
             }
             badchannels[imod].push_back(ch);
         }
-        for (int imod = 0; imod != (int)modules.size(); ++imod) {
-            Parallel(&Module::setBadChannels, {imod}, badchannels[imod]);
+        for (size_t imod = 0; imod != modules.size(); ++imod) {
+            // add empty vector if no bad channels in this module
+            if (badchannels.size() != imod + 1) {
+                badchannels.push_back(std::vector<int>{});
+            }
+            Parallel(&Module::setBadChannels, {static_cast<int>(imod)}, badchannels[imod]);
         }
 
     } else if (pos.size() != 1) {