diff --git a/src/PharoLauncher-Core/PhLImage.class.st b/src/PharoLauncher-Core/PhLImage.class.st
index 1ae0964c..7dc36449 100644
--- a/src/PharoLauncher-Core/PhLImage.class.st
+++ b/src/PharoLauncher-Core/PhLImage.class.st
@@ -118,6 +118,11 @@ PhLImage class >> isSubclassForLocation: imageFileReference [
 	^ versionFile exists and: [ versionFile contents beginsWith: self versionPrefix ]
 ]
 
+{ #category : #validating }
+PhLImage class >> isValidName: anImageName [ 
+	^ anImageName isNotEmpty and: [ (anImageName includesAny: #/\) not ]
+]
+
 { #category : #'instance creation' }
 PhLImage class >> location: imageFileReference [
 	| instance |
diff --git a/src/PharoLauncher-Spec2/PhLImageCreationPresenter.class.st b/src/PharoLauncher-Spec2/PhLImageCreationPresenter.class.st
index 47163510..7a9f8f69 100644
--- a/src/PharoLauncher-Spec2/PhLImageCreationPresenter.class.st
+++ b/src/PharoLauncher-Spec2/PhLImageCreationPresenter.class.st
@@ -13,14 +13,14 @@ Class {
 	#classTraits : 'TPhLInteractionTrait classTrait',
 	#instVars : [
 		'reservedImagesNamesCache',
-		'isNameOk',
 		'imageName',
 		'createButton',
 		'initScriptText',
 		'initScript',
 		'editInitScriptButton',
 		'descriptionText',
-		'imageNameCheck'
+		'imageNameCheck',
+		'isNameValid'
 	],
 	#category : #'PharoLauncher-Spec2'
 }
@@ -66,12 +66,13 @@ PhLImageCreationPresenter >> checkNewName: name [
 	I use a variable to know the state during the last validation."
 
 	| isValid |
-	isValid := name isEmpty or: [ reservedImagesNamesCache ifNotNil: [ reservedImagesNamesCache includes: name asLowercase ] ].
+	isValid := (PhLImage isValidName: name) 
+						and: [ reservedImagesNamesCache ifNotNil: [ (reservedImagesNamesCache includes: name asLowercase) not ] ].
 
 	"Image already in the right state. We skip."
-	isNameOk = isValid ifTrue: [ ^ self ].
+	isNameValid = isValid ifTrue: [ ^ self ].
 
-	(isNameOk := isValid) ifTrue: [ self showNameError ] ifFalse: [ self showNameOk ]
+	(isNameValid := isValid ) ifTrue: [ self showNameOk ] ifFalse: [ self showNameError ]
 ]
 
 { #category : #closing }
@@ -175,6 +176,11 @@ PhLImageCreationPresenter >> initializePresenters [
 	createButton disable
 ]
 
+{ #category : #testing }
+PhLImageCreationPresenter >> isNameValid [
+	^ isNameValid
+]
+
 { #category : #initialization }
 PhLImageCreationPresenter >> modelChanged [ 
 
@@ -190,6 +196,11 @@ PhLImageCreationPresenter >> noInitializationScriptItem [
 	^ (FileSystem memory root / 'No initialization script') ensureCreateFile
 ]
 
+{ #category : #accessing }
+PhLImageCreationPresenter >> okIcon [
+	^ self application iconNamed: #smallOk
+]
+
 { #category : #action }
 PhLImageCreationPresenter >> openScriptPresenter [
 
@@ -220,7 +231,7 @@ PhLImageCreationPresenter >> showNameOk [
 
 	self ifValidTemplate: [ createButton enable ].
 	imageNameCheck 
-		image: (self application iconNamed: #smallOk);
+		image: self okIcon;
 		help: 'Image name is valid!'
 ]
 
diff --git a/src/PharoLauncher-Spec2/PharoLauncherApplication.class.st b/src/PharoLauncher-Spec2/PharoLauncherApplication.class.st
index 9af3d05d..ba8792da 100644
--- a/src/PharoLauncher-Spec2/PharoLauncherApplication.class.st
+++ b/src/PharoLauncher-Spec2/PharoLauncherApplication.class.st
@@ -305,6 +305,7 @@ PharoLauncherApplication >> scriptsDirectory: aFileReference [
 
 { #category : #ui }
 PharoLauncherApplication >> shouldUpdateTemplateSources [
+
 	^ self newConfirm
 		title: 'Update';
 		label: 'Update available for Pharo Launcher templates sources!';
diff --git a/src/PharoLauncher-Tests-Core/PhLImageTest.class.st b/src/PharoLauncher-Tests-Core/PhLImageTest.class.st
index d299c8f7..e28c6eb4 100644
--- a/src/PharoLauncher-Tests-Core/PhLImageTest.class.st
+++ b/src/PharoLauncher-Tests-Core/PhLImageTest.class.st
@@ -157,6 +157,21 @@ PhLImageTest >> testDescriptionIsSetWhenNoDescriptionInMetadataButDescriptionFil
 		equals: desc.
 ]
 
+{ #category : #tests }
+PhLImageTest >> testImageNameIsNotValidWhenContainingFileSeparator [
+
+	self deny: (PhLImage isValidName: 'fo/o').
+	self deny: (PhLImage isValidName: '123\4').
+]
+
+{ #category : #tests }
+PhLImageTest >> testImageNameIsValidWithLettersAndNumbers [
+
+	self assert: (PhLImage isValidName: 'foo').
+	self assert: (PhLImage isValidName: '1234').
+	self assert: (PhLImage isValidName: 'Fo23')
+]
+
 { #category : #tests }
 PhLImageTest >> testPhLImageSerialization [
 	| stonString |
diff --git a/src/PharoLauncher-Tests-SpecUI/PhLImageCreationPresenterTest.class.st b/src/PharoLauncher-Tests-SpecUI/PhLImageCreationPresenterTest.class.st
index 4a0447b4..5c6b3629 100644
--- a/src/PharoLauncher-Tests-SpecUI/PhLImageCreationPresenterTest.class.st
+++ b/src/PharoLauncher-Tests-SpecUI/PhLImageCreationPresenterTest.class.st
@@ -17,6 +17,22 @@ PhLImageCreationPresenterTest >> setUp [
 				yourself)
 ]
 
+{ #category : #tests }
+PhLImageCreationPresenterTest >> testImageNameIsNotValidWhenContainingFileSeparator [ 
+
+	presenter checkNewName: 'foo/'.
+	
+	self deny: presenter isNameValid.
+]
+
+{ #category : #tests }
+PhLImageCreationPresenterTest >> testImageNameIsValid [
+
+	presenter checkNewName: 'nonExistingImageName'.
+	
+	self assert: presenter isNameValid.
+]
+
 { #category : #tests }
 PhLImageCreationPresenterTest >> testInitializationScriptListUpdatedWhenScriptPresenterDoChange [
 	| scriptPresenter |