diff --git a/nodes/assign.c b/nodes/assign.c
index c680ea3..fb56b8e 100644
--- a/nodes/assign.c
+++ b/nodes/assign.c
@@ -58,21 +58,33 @@ create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEn
 		has_payload = false;
 	const config_setting_t *setting;
 
-	if ((setting = config_setting_get_member(config->options, "namespace"))) {
-		has_ns = true;
-		source.code.ns = env_resolve_constant(env, setting);
-	}
-	if ((setting = config_setting_get_member(config->options, "major"))) {
-		has_maj = true;
-		source.code.major = env_resolve_constant(env, setting);
-	}
-	if ((setting = config_setting_get_member(config->options, "minor"))) {
-		has_min = true;
-		source.code.minor = env_resolve_constant(env, setting);
-	}
-	if ((setting = config_setting_get_member(config->options, "payload"))) {
-		has_payload = true;
-		source.payload = env_resolve_constant(env, setting);
+	if (config->options) {
+		if ((setting = config_setting_get_member(config->options, "namespace"))) {
+			has_ns = true;
+			source.code.ns = env_resolve_constant(env, setting);
+		}
+		if ((setting = config_setting_get_member(config->options, "major"))) {
+			has_maj = true;
+			source.code.major = env_resolve_constant(env, setting);
+		}
+		if ((setting = config_setting_get_member(config->options, "minor"))) {
+			has_min = true;
+			source.code.minor = env_resolve_constant(env, setting);
+		}
+		if ((setting = config_setting_get_member(config->options, "payload"))) {
+			has_payload = true;
+			source.payload = env_resolve_constant(env, setting);
+		}
+	} else {
+		// Prevent warning for uninitialized variable
+		source = (EventData) {
+			.code = {
+				.ns = 0,
+				.major = 0,
+				.minor = 0,
+			},
+			.payload = 0,
+		};
 	}
 
 	*node = (AssignGraphNode) {
diff --git a/nodes/differentiate.c b/nodes/differentiate.c
index 5546ca7..61a47ea 100644
--- a/nodes/differentiate.c
+++ b/nodes/differentiate.c
@@ -42,7 +42,6 @@ create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEn
 
 	int64_t initial = 0;
 	if (config->options) {
-		// FIXME check config->options for NULL in all node types
 		initial = env_resolve_constant(env, config_setting_get_member(config->options, "initial"));
 	}
 
diff --git a/nodes/evdev.c b/nodes/evdev.c
index bfa6b24..e2d2ccb 100644
--- a/nodes/evdev.c
+++ b/nodes/evdev.c
@@ -77,7 +77,7 @@ create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEn
 	}
 	const char *filename = NULL;
 	bool should_grab = false;
-	if (config) {
+	if (config->options) {
 		node->namespace = env_resolve_constant(env, config_setting_get_member(config->options, "namespace"));
 		should_grab = env_resolve_constant(env, config_setting_get_member(config->options, "grab")) != 0;
 		config_setting_lookup_string(config->options, "file", &filename);
diff --git a/nodes/getchar.c b/nodes/getchar.c
index 44eb9ed..99e03bb 100644
--- a/nodes/getchar.c
+++ b/nodes/getchar.c
@@ -70,7 +70,7 @@ create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEn
 			.handle_io = handle_io,
 			.enabled = true,
 		},
-		.namespace = env_resolve_constant(env, config_setting_get_member(config->options, "namespace")),
+		.namespace = config->options ? env_resolve_constant(env, config_setting_get_member(config->options, "namespace")) : 0,
 	};
 	return &node->as_GraphNode;
 }
diff --git a/nodes/modifiers.c b/nodes/modifiers.c
index bf6a1c9..d034a00 100644
--- a/nodes/modifiers.c
+++ b/nodes/modifiers.c
@@ -30,8 +30,10 @@ handle_event(EventPositionBase * self, EventNode * event)
 static GraphNode *
 create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEnvironment * env)
 {
-	(void) config;
-	(void) env;
+	if (!config->options) {
+		return NULL;
+	}
+
 	ModifiersGraphNode * node = T_ALLOC(1, ModifiersGraphNode);
 	if (!node) {
 		return NULL;
diff --git a/nodes/modify_predicate.c b/nodes/modify_predicate.c
index ed8611f..4579c72 100644
--- a/nodes/modify_predicate.c
+++ b/nodes/modify_predicate.c
@@ -50,8 +50,10 @@ handle_event(EventPositionBase * self, EventNode * event)
 static GraphNode *
 create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEnvironment * env)
 {
-	(void) config;
-	(void) env;
+	if (!config->options) {
+		return NULL;
+	}
+
 	ModifyPredicateGraphNode * node = T_ALLOC(1, ModifyPredicateGraphNode);
 	if (!node) {
 		return NULL;
diff --git a/nodes/router.c b/nodes/router.c
index 5cd59b8..4214a8c 100644
--- a/nodes/router.c
+++ b/nodes/router.c
@@ -28,8 +28,10 @@ handle_event(EventPositionBase * self, EventNode * event)
 static GraphNode *
 create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEnvironment * env)
 {
-	(void) config;
-	(void) env;
+	if (!config->options) {
+		return NULL;
+	}
+
 	RouterGraphNode * node = T_ALLOC(1, RouterGraphNode);
 	if (!node) {
 		return NULL;
diff --git a/nodes/uinput.c b/nodes/uinput.c
index 533661e..f745c0d 100644
--- a/nodes/uinput.c
+++ b/nodes/uinput.c
@@ -78,6 +78,10 @@ handle_event(EventPositionBase * self, EventNode * event)
 static GraphNode *
 create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEnvironment * env)
 {
+	if (!config->options) {
+		return NULL;
+	}
+
 	UinputGraphNode * node = T_ALLOC(1, UinputGraphNode);
 	if (!node) {
 		return NULL;