diff --git a/apps/calculation/calculation.cpp b/apps/calculation/calculation.cpp
index 92d615b5f..975ed02f3 100644
--- a/apps/calculation/calculation.cpp
+++ b/apps/calculation/calculation.cpp
@@ -254,25 +254,32 @@ Calculation::AdditionalInformationType Calculation::additionalInformationType(Co
   }
   if (o.hasUnit()) {
     Expression unit;
-    PoincareHelpers::Reduce(&o, App::app()->localContext(), ExpressionNode::ReductionTarget::User,ExpressionNode::SymbolicComputation::ReplaceAllSymbolsWithDefinitionsOrUndefined, ExpressionNode::UnitConversion::None);
+    PoincareHelpers::Reduce(&o,
+        App::app()->localContext(),
+        ExpressionNode::ReductionTarget::User,
+        ExpressionNode::SymbolicComputation::ReplaceAllSymbolsWithDefinitionsOrUndefined,
+        ExpressionNode::UnitConversion::None);
     o = o.removeUnit(&unit);
-    if (Unit::IsSI(unit)) {
-      if (Unit::IsSISpeed(unit) || Unit::IsSIVolume(unit) || Unit::IsSIEnergy(unit)) {
-        /* All these units will provide misc. classic representatives in
-         * addition to the SI unit in additional information. */
-        return AdditionalInformationType::Unit;
-      }
-      if (Unit::IsSITime(unit)) {
-        /* If the number of seconds is above 60s, we can write it in the form
-         * of an addition: 23_min + 12_s for instance. */
-        double value = Shared::PoincareHelpers::ApproximateToScalar<double>(o, App::app()->localContext());
-        if (value >  Unit::SecondsPerMinute) {
+    // There might be no unit in the end, if the reduction was interrupted.
+    if (!unit.isUninitialized()) {
+      if (Unit::IsSI(unit)) {
+        if (Unit::IsSISpeed(unit) || Unit::IsSIVolume(unit) || Unit::IsSIEnergy(unit)) {
+          /* All these units will provide misc. classic representatives in
+           * addition to the SI unit in additional information. */
           return AdditionalInformationType::Unit;
         }
+        if (Unit::IsSITime(unit)) {
+          /* If the number of seconds is above 60s, we can write it in the form
+           * of an addition: 23_min + 12_s for instance. */
+          double value = Shared::PoincareHelpers::ApproximateToScalar<double>(o, App::app()->localContext());
+          if (value >  Unit::SecondsPerMinute) {
+            return AdditionalInformationType::Unit;
+          }
+        }
+        return AdditionalInformationType::None;
       }
-      return AdditionalInformationType::None;
+      return AdditionalInformationType::Unit;
     }
-    return AdditionalInformationType::Unit;
   }
   if (o.isBasedIntegerCappedBy(k_maximalIntegerWithAdditionalInformation)) {
     return AdditionalInformationType::Integer;