diff --git a/plugin/FormData.php b/plugin/FormData.php
index eb24515f9..a1e5b0ce4 100644
--- a/plugin/FormData.php
+++ b/plugin/FormData.php
@@ -98,7 +98,9 @@ public function getMissingFields(): array
 		$missing = [];
 
 		if ($this->_formSent) {
-			$filledFormData = array_filter($this->_values);
+			$filledFormData = array_filter($this->_values, function ($v) {
+				return $v !== 0;
+			});
 			$requiredFields = array_flip($this->_requiredFields);
 			$filled = array_intersect_key($filledFormData, $requiredFields);
 			$missingKeyValues = array_diff_key($requiredFields, $filled);
diff --git a/plugin/FormPost.php b/plugin/FormPost.php
index 0b9576c21..edda8cf41 100644
--- a/plugin/FormPost.php
+++ b/plugin/FormPost.php
@@ -218,8 +218,9 @@ private function buildFormData(DataFormConfiguration $pFormConfig, $formNo): For
 		$formFields = $this->getAllowedPostVars($pFormConfig);
 		$formData = $pFormFieldValidator->getValidatedValues($formFields, $this->_pFieldsCollection);
 		$requiredFields = $this->getAllowedRequiredFields($requiredFields);
+		$requiredFieldsAreAllowed = $this->getAllowedRequiredFieldsIsRangeField($requiredFields);
 		$pFormData = new FormData($pFormConfig, $formNo);
-		$pFormData->setRequiredFields($requiredFields);
+		$pFormData->setRequiredFields($requiredFieldsAreAllowed);
 		$pFormData->setFormtype($pFormConfig->getFormType());
 		$pFormData->setValues($formData);
 
@@ -269,6 +270,27 @@ protected function getAllowedRequiredFields($requiredFields): array
 		}
 		return $activeRequiredFields;
 	}
+ 
+	/**
+	 *
+	 * @param array $requiredFields
+	 * @return string[]
+	 *
+	 */
+
+	private function getAllowedRequiredFieldsIsRangeField(array $requiredFields): array
+	{
+		foreach ($requiredFields as $key => $value) {
+			$isRangeField = $this->_pFieldsCollection->getFieldByKeyUnsafe($value)->getIsRangeField();
+			if ($isRangeField) {
+				array_push($requiredFields, $value.'__von');
+				array_push($requiredFields, $value.'__bis');
+				unset($requiredFields[$key]);
+			}
+		}
+
+		return $requiredFields;
+	}
 
 
 	/**
diff --git a/tests/TestClassFormPostInterest.php b/tests/TestClassFormPostInterest.php
index a5c1d2799..70f1e8170 100644
--- a/tests/TestClassFormPostInterest.php
+++ b/tests/TestClassFormPostInterest.php
@@ -106,6 +106,8 @@ public function prepare()
 			'kaufpreis__von' => onOfficeSDK::MODULE_SEARCHCRITERIA,
 			'kaufpreis__bis' => onOfficeSDK::MODULE_SEARCHCRITERIA,
 			'krit_bemerkung_oeffentlich' => onOfficeSDK::MODULE_SEARCHCRITERIA,
+			'stp_anzahl__von' => onOfficeSDK::MODULE_SEARCHCRITERIA,
+			'stp_anzahl__bis' => onOfficeSDK::MODULE_SEARCHCRITERIA,
 		]));
 
 		$this->_pFieldsCollectionBuilderShort = $this->getMockBuilder(FieldsCollectionBuilderShort::class)
@@ -136,6 +138,11 @@ public function prepare()
 				$pField4->setLabel('Comment');
 				$pFieldsCollection->addField($pField4);
 
+				$pField5 = new Field('stp_anzahl', onOfficeSDK::MODULE_SEARCHCRITERIA);
+				$pField5->setType(FieldTypes::FIELD_TYPE_FLOAT);
+				$pField5->setIsRangeField(true);
+				$pFieldsCollection->addField($pField5);
+
 				return $this->_pFieldsCollectionBuilderShort;
 			}));
 
@@ -174,6 +181,11 @@ public function prepare()
 				$pField2->setLabel('Kaufpreis');
 				$pFieldsCollection->addField($pField2);
 
+				$pFieldStpAnzahl = new Field('stp_anzahl', onOfficeSDK::MODULE_ESTATE);
+				$pFieldStpAnzahl->setType(FieldTypes::FIELD_TYPE_FLOAT);
+				$pFieldStpAnzahl->setLabel('Stp_anzahl');
+				$pFieldsCollection->addField($pFieldStpAnzahl);
+
 				return $this->_pFieldsCollectionBuilderShort;
 			}));
 
@@ -216,7 +228,9 @@ public function testInitialCheck()
 			'kaufpreis__von' => '200000.00',
 			'kaufpreis__bis' => '800000.00',
 			'objekttyp' => ['reihenendhaus', 'reihenhaus'],
-			'krit_bemerkung_oeffentlich' => 'comment3'
+			'krit_bemerkung_oeffentlich' => 'comment3',
+			'stp_anzahl__von' => '20.00',
+			'stp_anzahl__bis' => '40.00',
 		];
 
 		$pConfig = $this->getNewDataFormConfigurationInterest();
@@ -245,6 +259,8 @@ public function testUnsuccessful()
 			'vermarktungsart' => 'kauf',
 			'kaufpreis__von' => '200000.00',
 			'kaufpreis__bis' => '800000.00',
+			'stp_anzahl__von' => '20.00',
+			'stp_anzahl__bis' => '40.00'
 		];
 
 		$unsuccessfulCombinations = [
@@ -287,7 +303,7 @@ public function testMissingFields()
 		$pFormData = $this->_pFormPostInterest->getFormDataInstance('interestform', 3);
 
 		$this->assertEquals(FormPost::MESSAGE_REQUIRED_FIELDS_MISSING, $pFormData->getStatus());
-		$this->assertEquals(['Name', 'vermarktungsart'], $pFormData->getMissingFields());
+		$this->assertEquals(['Name', 'vermarktungsart', 'stp_anzahl__von' , 'stp_anzahl__bis'], $pFormData->getMissingFields());
 	}
 
 
@@ -305,11 +321,12 @@ private function getNewDataFormConfigurationInterest(): DataFormConfigurationInt
 		$pConfig->addInput('Email', onOfficeSDK::MODULE_ADDRESS);
 		$pConfig->addInput('vermarktungsart', onOfficeSDK::MODULE_SEARCHCRITERIA);
 		$pConfig->addInput('kaufpreis', onOfficeSDK::MODULE_SEARCHCRITERIA);
+		$pConfig->addInput('stp_anzahl', onOfficeSDK::MODULE_SEARCHCRITERIA);
 		$pConfig->addInput('message', '');
 		$pConfig->addInput('krit_bemerkung_oeffentlich', onOfficeSDK::MODULE_SEARCHCRITERIA);
 		$pConfig->setFormName('interestform');
 		$pConfig->setRecipient('test@my-onoffice.com');
-		$pConfig->setRequiredFields(['Vorname', 'Name', 'vermarktungsart']);
+		$pConfig->setRequiredFields(['Vorname', 'Name', 'vermarktungsart', 'stp_anzahl']);
 		$pConfig->setSubject('Interest');
 		$pConfig->setTemplate('testtemplate.php');
 		$pConfig->setFormType(Form::TYPE_INTEREST);
@@ -381,6 +398,8 @@ private function addApiResponseCreateSearchCriteria(bool $success)
 				'krit_bemerkung_oeffentlich' => 'comment3',
 				'kaufpreis__von' => 200000.00,
 				'kaufpreis__bis' => 800000.00,
+				'stp_anzahl__von' => 20.00,
+				'stp_anzahl__bis' => 40.00,
 			],
 			'addressid' => 294,
 		];
@@ -433,7 +452,7 @@ private function addApiResponseSendMail(bool $success)
 				'Name' => 'Doe',
 				'Email' => 'john@doemail.com'
 			],
-			'message' => "\nSuchkriterien des Interessenten:\nVermarktungsart: Kauf\nComment: comment3\nKaufpreis (min): 200000\nKaufpreis (max): 800000",
+			'message' => "\nSuchkriterien des Interessenten:\nVermarktungsart: Kauf\nComment: comment3\nKaufpreis (min): 200000\nKaufpreis (max): 800000\nStp_anzahl (min): 20\nStp_anzahl (max): 40",
 			'subject' => 'Interest',
 			'formtype' => Form::TYPE_INTEREST,
 			"referrer" => "",