A mathematical operation was performed with an invalid value (e.g. infinity, division by zero, or calculation with null).
This most commonly occurs when importing an issued invoice (whether from XML or Excel), where foreign currency totals are added to the header. The issue is likely related to the exchange rate (e.g. an exchange rate of 0 is specified, which cannot occur for a foreign currency invoice).
This error can also occur with fixed assets — for example, when filling in an event and confirming that the change should be reflected in depreciation, even though no depreciation entries exist for the asset.