diff --git a/raptor_eagle_ccd.cpp b/raptor_eagle_ccd.cpp
index ca9d03f..c8a93f8 100644
--- a/raptor_eagle_ccd.cpp
+++ b/raptor_eagle_ccd.cpp
@@ -1326,11 +1326,13 @@ void RaptorEagleCCD::initAttrComm()
     addAttribute(
         CAMERA_ATTR_FITS_TEMPLATE,
         [this]() {
-            logTrace("Return current FITS-image header template filename as {}", _currentTemplateFile);
+            logTrace("Return current FITS-image header template filename as {}",
+                     _currentTemplateFile.size() ? _currentTemplateFile : "<empty string>");
             return _currentTemplateFile;
         },
         [this](const std::string& filename) {
-            logDebug("Set current FITS-image header template filename to {}", filename);
+            logDebug("Set current FITS-image header template filename to {}",
+                     filename.size() ? filename : "<empty string>");
 
             _currentTemplateFile = filename;
         });