diff --git a/modules/dsn/managers/radecmanager.cpp b/modules/dsn/managers/radecmanager.cpp
index 4adec6e2d3..3fad0c4f65 100644
--- a/modules/dsn/managers/radecmanager.cpp
+++ b/modules/dsn/managers/radecmanager.cpp
@@ -81,26 +81,30 @@ namespace openspace {
 
    bool RadecManager::radecParser(int index) const{
        std::string filename;
-       filename = _dataFiles[index];
-       std::ifstream ifs(filename);
-       nlohmann::json j = nlohmann::json::parse(ifs);
+       if (index > -1 && index < _dataFiles.size()) {
+         filename = _dataFiles[index];
+               std::ifstream ifs(filename);
+               nlohmann::json j = nlohmann::json::parse(ifs);
 
-       int objectCounter = 0;
-       for (const auto& pos : j["Positions"]) {
-           objectCounter++;
-           try {
-               position.timeStamp = pos["TimeStamp"].get<std::string>();
-               position.ra = pos["RADn"].get<double>();
-               position.dec = pos["DecDn"].get<double>();
-               position.range = pos["GeoRngDn"].get<double>();
-               position.lightTravelTime = pos["DLT"].get<double>();
-           }
-           catch (const std::exception& e) {
-               LERROR(fmt::format("{}: Error in json object number {} while reading file '{}'", objectIdentifier, objectCounter, filename));
-           }
-           RadecManager::positions.push_back(position); 
+               int objectCounter = 0;
+               for (const auto& pos : j["Positions"]) {
+                   objectCounter++;
+                   try {
+                       position.timeStamp = pos["TimeStamp"].get<std::string>();
+                       position.ra = pos["RADn"].get<double>();
+                       position.dec = pos["DecDn"].get<double>();
+                       position.range = pos["GeoRngDn"].get<double>();
+                       position.lightTravelTime = pos["DLT"].get<double>();
+                   }
+                   catch (const std::exception& e) {
+                       LERROR(fmt::format("{}: Error in json object number {} while reading file '{}'", objectIdentifier, objectCounter, filename));
+                   }
+                   RadecManager::positions.push_back(position); 
+               }
+               return true;
        }
-       return true;
+       else return false;
+      
    }
 
    void RadecManager::updateActiveMinute(int idx) const{