diff --git a/schema.json b/schema.json
index 506d989a..608bffe0 100644
--- a/schema.json
+++ b/schema.json
@@ -5138,7 +5138,7 @@
           "yahooFinanceType": "number|null"
         },
         "sellingGeneralAdministrative": {
-          "yahooFinanceType": "number"
+          "yahooFinanceType": "number|null"
         },
         "nonRecurring": {
           "yahooFinanceType": "number|null"
diff --git a/src/modules/quoteSummary-iface.ts b/src/modules/quoteSummary-iface.ts
index 9c390ed9..fd9903e6 100644
--- a/src/modules/quoteSummary-iface.ts
+++ b/src/modules/quoteSummary-iface.ts
@@ -513,7 +513,7 @@ export interface IncomeStatementHistoryElement {
   costOfRevenue: number;
   grossProfit: number;
   researchDevelopment: number | null;
-  sellingGeneralAdministrative: number;
+  sellingGeneralAdministrative: number | null;
   nonRecurring: number | null;
   otherOperatingExpenses: number | null;
   totalOperatingExpenses: number;
diff --git a/src/modules/quoteSummary.spec.ts b/src/modules/quoteSummary.spec.ts
index 78d30ab5..49ca508f 100644
--- a/src/modules/quoteSummary.spec.ts
+++ b/src/modules/quoteSummary.spec.ts
@@ -1,9 +1,16 @@
 import quoteSummary, { QuoteSummaryModules } from "./quoteSummary.js";
 import { InvalidOptionsError } from "../lib/errors.js";
 
-import { testSymbols } from "../../tests/symbols.js";
+import { testSymbols as commonTestSymbols } from "../../tests/symbols.js";
 import testYf from "../../tests/testYf.js";
 
+const testSymbols = [
+  ...commonTestSymbols,
+  // incomeStatementHistory/sellingGeneralAdministrative is null (#258)
+  // "Got {}->null for 'number', did you want 'number | null' ?"
+  "CMCOM.AS",
+];
+
 const yf = testYf({ quoteSummary });
 
 interface itValidatesOpts {