diff --git a/include/GException.hpp b/include/GException.hpp
index 7a50193..3c94844 100644
--- a/include/GException.hpp
+++ b/include/GException.hpp
@@ -459,6 +459,15 @@ public:
                                std::string message = "");
     };
 
+
+    // GCvs exceptions
+    class cvs_bad_columns : public GExceptionHandler {
+    public:
+        cvs_bad_columns(std::string origin, std::string filename,
+                        int rows, int cols, int elements,
+                        std::string message = "");
+    };
+
 };
 
 #endif /* GEXCEPTION_HPP */
diff --git a/src/support/GException.cpp b/src/support/GException.cpp
index dfab5c0..7816150 100644
--- a/src/support/GException.cpp
+++ b/src/support/GException.cpp
@@ -50,6 +50,7 @@ GException::feature_not_implemented::feature_not_implemented(std::string origin,
                  " https://sourceforge.net/projects/gammalib/,"
                  " join this error message and provide a detailed"
                  " description of your needs.";
+    return;
 }
 
 
@@ -63,6 +64,7 @@ GException::bad_type::bad_type(std::string origin, std::string message)
 {
     m_origin   = origin;
     m_message = "Invalud type conversion. " + message;
+    return;
 }
 
 
@@ -76,6 +78,7 @@ GException::mem_alloc::mem_alloc(std::string origin, unsigned num)
 {
     m_origin  = origin;
     m_message = "Memory allocation error (" + str((int)num) + " elements)";
+    return;
 }
 
 
@@ -89,6 +92,7 @@ GException::not_enough_nodes::not_enough_nodes(std::string origin, int num)
 {
     m_origin  = origin;
     m_message = "Not enough nodes in node array (" + str(num) + " nodes).";
+    return;
 }
 
 
@@ -102,6 +106,7 @@ GException::file_not_found::file_not_found(std::string origin, std::string filen
 {
     m_origin  = origin;
     m_message = "File \"" + filename +"\" not found.";
+    return;
 }
 
 
@@ -115,4 +120,30 @@ GException::file_open_error::file_open_error(std::string origin, std::string fil
 {
     m_origin  = origin;
     m_message = "Unable to open file \"" + filename +"\"";
+    return;
+}
+
+
+/***********************************************************************//**
+ * @brief Bad CSV columns encountered
+ *
+ * @param[in] origin Name of method that has thrown the exception.
+ * @param[in] filename Filename.
+ * @param[in] row CSV file row.
+ * @param[in] cols Expected number of columns.
+ * @param[in] elements Found number of columns.
+ * @param[in] message Optional message.
+ ***************************************************************************/
+GException::cvs_bad_columns::cvs_bad_columns(std::string origin,
+                                             std::string filename,
+                                             int         row,
+                                             int         cols,
+                                             int         elements,
+                                             std::string message)
+{
+    m_origin  = origin;
+    m_message = "Inconsistent number of columns found in row "+str(row)+
+                " of file \""+filename+"\" ("+str(cols)+" expected, "+
+                str(elements)+" encountered). "+message;
+    return;
 }