diff --git a/projects/cdk/karma.conf.js b/projects/cdk/karma.conf.js
index c743656e3c38..d5fc3979853c 100644
--- a/projects/cdk/karma.conf.js
+++ b/projects/cdk/karma.conf.js
@@ -1,4 +1,4 @@
-const base = require('../../karma.conf');
+const base = require('../../karma.config');
 
 module.exports = function (config) {
     base(config);
diff --git a/projects/cdk/observables/index.ts b/projects/cdk/observables/index.ts
index b34049d79e61..1317c2d6847f 100644
--- a/projects/cdk/observables/index.ts
+++ b/projects/cdk/observables/index.ts
@@ -3,6 +3,7 @@ export * from './focus-visible-observable';
 export * from './is-alive';
 export * from './items-query-list-observable';
 export * from './mouse-drag-finish-from';
+export * from './must-be-present';
 export * from './pressed-observable';
 export * from './prevent-default';
 export * from './replay-control-value-changes';
diff --git a/projects/cdk/observables/must-be-present.ts b/projects/cdk/observables/must-be-present.ts
new file mode 100644
index 000000000000..1e1b17dc65a4
--- /dev/null
+++ b/projects/cdk/observables/must-be-present.ts
@@ -0,0 +1,13 @@
+import {isPresent} from '@taiga-ui/cdk/utils/miscellaneous';
+import {OperatorFunction} from 'rxjs';
+import {map} from 'rxjs/operators';
+
+export function mustBePresent<T>(): OperatorFunction<T | undefined | null, T> {
+    return map(value => {
+        if (!isPresent(value)) {
+            throw new Error('Value must present');
+        }
+
+        return value;
+    });
+}
diff --git a/projects/cdk/observables/test/must-be-present.spec.ts b/projects/cdk/observables/test/must-be-present.spec.ts
new file mode 100644
index 000000000000..b79673af01ba
--- /dev/null
+++ b/projects/cdk/observables/test/must-be-present.spec.ts
@@ -0,0 +1,72 @@
+import {fakeAsync, tick} from '@angular/core/testing';
+import {mustBePresent} from '@taiga-ui/cdk/observables/must-be-present';
+import {Subject} from 'rxjs';
+import {first} from 'rxjs/operators';
+
+describe('mustBePresent operator function', () => {
+    it('not throws on NaN', fakeAsync(() => {
+        const stream = new Subject<number | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next(NaN);
+            tick();
+        }).not.toThrow();
+    }));
+
+    it('not throws on 0', fakeAsync(() => {
+        const stream = new Subject<number | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next(0);
+            tick();
+        }).not.toThrow();
+    }));
+
+    it('not throws on false', fakeAsync(() => {
+        const stream = new Subject<boolean | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next(false);
+            tick();
+        }).not.toThrow();
+    }));
+
+    it('not throws on empty string', fakeAsync(() => {
+        const stream = new Subject<string | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next('');
+            tick();
+        }).not.toThrow();
+    }));
+
+    it('throws on undefined', fakeAsync(() => {
+        const stream = new Subject<undefined | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next(undefined);
+            tick();
+        }).toThrow();
+    }));
+
+    it('throws on null', fakeAsync(() => {
+        const stream = new Subject<undefined | null>();
+
+        stream.pipe(first(), mustBePresent()).subscribe();
+
+        expect(() => {
+            stream.next(null);
+            tick();
+        }).toThrow();
+    }));
+});
diff --git a/projects/core/package.json b/projects/core/package.json
index 505a09f8df81..48579005f9c7 100644
--- a/projects/core/package.json
+++ b/projects/core/package.json
@@ -22,7 +22,7 @@
         "@angular/forms": ">=6.0.0",
         "@angular/platform-browser": ">=6.0.0",
         "@angular/router": ">=6.0.0",
-        "@tinkoff/ng-event-filters": ">=1.0.0",
+        "@tinkoff/ng-event-plugins": ">=1.0.1",
         "@tinkoff/ng-polymorpheus": ">=2.0.0",
         "rxjs": ">=6.0.0"
     }