diff --git a/AUTHORS b/AUTHORS
index 24b3f475a..dec886fdb 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -291,3 +291,4 @@ suggestions:
   Reg
   Yaroslav Molochko
   Michael Meier
+  Slaven ʙanovic
diff --git a/ChangeLog b/ChangeLog
index e031b691b..8145a2e5f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,8 @@
           pending tasks.
 - TW-1795 Calendar underline on Day padding
           (thanks to Renato Alves).
+- TW-1806 project:ide is not allowed
+          (thanks to Slaven ʙanovic).
 - Added 'juhannus' as a synonym for 'midsommarafton'
           (thanks to Lynoure Braakman).
 - Deprecated the 'DUETODAY' virtual tag, which is a synonym for the 'TODAY'
diff --git a/src/Eval.cpp b/src/Eval.cpp
index 7a4d9fc61..9736d0981 100644
--- a/src/Eval.cpp
+++ b/src/Eval.cpp
@@ -387,7 +387,7 @@ void Eval::evaluatePostfixStack (
   // If there is more than one variant left on the stack, then the original
   // expression was not valid.
   if (values.size () != 1)
-    throw std::string (STRING_EVAL_NO_EVAL);
+    throw std::string (STRING_EVAL_NOT_EXPRESSION);
 
   result = values[0];
 }
diff --git a/src/columns/ColProject.cpp b/src/columns/ColProject.cpp
index 0e803aae9..f94a967f0 100644
--- a/src/columns/ColProject.cpp
+++ b/src/columns/ColProject.cpp
@@ -124,15 +124,30 @@ void ColumnProject::modify (Task& task, const std::string& value)
   if (lexer.token (domRef, type) &&
       type == Lexer::Type::dom)
   {
-    Eval e;
-    e.addSource (domSource);
-    e.addSource (namedDates);
-    contextTask = task;
+    try
+    {
+      Eval e;
+      e.addSource (domSource);
+      e.addSource (namedDates);
+      contextTask = task;
 
-    Variant v;
-    e.evaluateInfixExpression (value, v);
-    task.set (_name, (std::string) v);
-    context.debug (label + _name + " <-- '" + (std::string) v + "' <-- '" + value + "'");
+      Variant v;
+      e.evaluateInfixExpression (value, v);
+      task.set (_name, (std::string) v);
+      context.debug (label + _name + " <-- '" + (std::string) v + "' <-- '" + value + "'");
+    }
+    catch (const std::string& e)
+    {
+      // If the expression failed because it didn't look like an expression,
+      // simply store it as-is.
+      if (e == STRING_EVAL_NOT_EXPRESSION)
+      {
+        task.set (_name, value);
+        context.debug (label + _name + " <-- '" + value + "'");
+      }
+      else
+        throw;
+    }
   }
   else
   {
diff --git a/src/l10n/deu-DEU.h b/src/l10n/deu-DEU.h
index 3135d37ac..960195312 100644
--- a/src/l10n/deu-DEU.h
+++ b/src/l10n/deu-DEU.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Nicht unterstützter Operator: '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operator erwartet."
 #define STRING_EVAL_NO_EVAL          "Der Ausdruck konnte nicht ausgewertet werden."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Ungültige Klammerung in Ausdruck."
 
 // edit
diff --git a/src/l10n/eng-USA.h b/src/l10n/eng-USA.h
index 84de21d6b..0e58ee66a 100644
--- a/src/l10n/eng-USA.h
+++ b/src/l10n/eng-USA.h
@@ -679,6 +679,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Unsupported operator '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operator expected."
 #define STRING_EVAL_NO_EVAL          "The expression could not be evaluated."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Mismatched parentheses in expression"
 
 // edit
diff --git a/src/l10n/epo-RUS.h b/src/l10n/epo-RUS.h
index cb07b51e7..fa09d5ee6 100644
--- a/src/l10n/epo-RUS.h
+++ b/src/l10n/epo-RUS.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Ne subtenas infikson '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Anticipis infikson."
 #define STRING_EVAL_NO_EVAL          "Ne povis kalkuli la esprimon."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Malbalancataj parentezoj en esprimo"
 
 // edit
diff --git a/src/l10n/esp-ESP.h b/src/l10n/esp-ESP.h
index c46fd745e..303f2723d 100644
--- a/src/l10n/esp-ESP.h
+++ b/src/l10n/esp-ESP.h
@@ -690,6 +690,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Operador no soportado '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Se esperaba operador."
 #define STRING_EVAL_NO_EVAL          "La expresión podría no ser evaluada."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Paréntesis desemparejados en expresión"
 
 // edit
diff --git a/src/l10n/fra-FRA.h b/src/l10n/fra-FRA.h
index 4046ed457..5bb47aef0 100644
--- a/src/l10n/fra-FRA.h
+++ b/src/l10n/fra-FRA.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Unsupported operator '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operator expected."
 #define STRING_EVAL_NO_EVAL          "The expression could not be evaluated."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Mismatched parentheses in expression"
 
 // edit
diff --git a/src/l10n/ita-ITA.h b/src/l10n/ita-ITA.h
index 95e0da6b2..86d8969d5 100644
--- a/src/l10n/ita-ITA.h
+++ b/src/l10n/ita-ITA.h
@@ -680,6 +680,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Operatore non supportato '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operator expected."
 #define STRING_EVAL_NO_EVAL          "The expression could not be evaluated."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Mismatched parentheses in expression"
 
 // edit
diff --git a/src/l10n/jpn-JPN.h b/src/l10n/jpn-JPN.h
index e82ba9bc7..4ef19a050 100644
--- a/src/l10n/jpn-JPN.h
+++ b/src/l10n/jpn-JPN.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Unsupported operator '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operator expected."
 #define STRING_EVAL_NO_EVAL          "式を評価出来ません。"
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Mismatched parentheses in expression"
 
 // edit
diff --git a/src/l10n/pol-POL.h b/src/l10n/pol-POL.h
index 1264c3f6f..c6e1d7723 100644
--- a/src/l10n/pol-POL.h
+++ b/src/l10n/pol-POL.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Niewspierany operator '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Oczekiwany operator."
 #define STRING_EVAL_NO_EVAL          "Wyrażenie nie może być przetworzone."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Niedopasowane nawiasy w wyrażeniu"
 
 // edit
diff --git a/src/l10n/por-PRT.h b/src/l10n/por-PRT.h
index 0de68ed5c..0c73f794e 100644
--- a/src/l10n/por-PRT.h
+++ b/src/l10n/por-PRT.h
@@ -681,6 +681,7 @@
 #define STRING_EVAL_UNSUPPORTED      "Operador não suportado '{1}'."
 #define STRING_EVAL_OP_EXPECTED      "Operador em falta."
 #define STRING_EVAL_NO_EVAL          "Não foi possível calcular a expressão."
+#define STRING_EVAL_NOT_EXPRESSION   "The value is not an expression."
 #define STRING_PAREN_MISMATCH        "Parentesis incompatíveis na expressão."
 
 // edit